Europaisches Patentamt
European Patent Office
Office europeen des brevets
EUROPEAN
published
© Publication number:
©
International publication number:
WO 93/02460 (04.02.93 93/04)
©
Priority: 24.07.91 JP 184303/91
©
Date of publication of application:
21.07.93 Bulletin 93/29
A1
int. CIA H01B 13/00, C01G 2 9 / 0 0 ,
C01G 1/00, C04B 3 5 / 0 0 ,
B21C 1/00, B21C 9 / 0 0 ,
//H01B12/04
@ Date of filing: 22.07.92
International application number:
PCT/JP92/00935
523
PATENT A P P L I C A T I O N
in a c c o r d a n c e with Art.
158(3) E P C
© Application number: 92916222.0
©
0 551
5-2, Nagatacho 2-chome
Chiyoda-ku Tokyo100(JP)
©
Inventor: KATO, Takeshi, Osaka Works of
Sumitomo Electric
Industries, Ltd. 1-3, Shimaya 1-chome
Konohana-ku
Osaka-shi Osaka 554(JP)
Inventor: SATO, Kenichi, Osaka Works of
Sumitomo Electric
Industries, Ltd. 1-3, Shimaya 1-chome
Konohana-ku
Osaka-shi Osaka 554(JP)
©
Representative: KUHNEN, WACKER &
PARTNER
Alois-Steinecker-Strasse 22 Postfach 1553
W-8050 Freising (DE)
@ Designated Contracting States:
CH DE FR GB IT LI NL
© Applicant: SUMITOMO ELECTRIC INDUSTRIES,
LTD.
5-33, Kitahama 4-chome, Chuo-ku
Osaka-shi, Osaka 541 (JP)
Applicant: JAPAN as represented by
DIRECTOR GENERAL OF NATIONAL
RESEARCH INSTITUTE FOR METALS OF
SCIENCE AND TECHNOLOGY AGENCY
1-12, Nakameguro 2-chome, Meguro-ku
Tokyo 153(JP)
Applicant: RESEARCH DEVELOPMENT
CORPORATION OF JAPAN
(54) METHOD FOR MANUFACTURING SUPERCONDUCTIVE WIRE MATERIAL OF BISMUTH BASED OXIDE.
00
CM
© A manufacturing method wherein a metal sheath is filled with a powder having a composition such that the
amounts of Sr, Ca and Cu are larger than conventional so that in addition to the 2223-phase of (Bi, Pb)-Sr-Ca-Cu
the phase of Sr-Ca-Cu-0 may be precipitated, and then, this metal sheath is subjected to a plastic working, a
primary heat treatment, another plastic working, and a secondary heat treatment in this order. A pinning point
based on the phase of Sr-Ca-Cu-0 is introduced into the superconductor of the obtained bismuth based oxide
superconductive wire material, and thereby, the magnetic field characteristic of the critical current density is
improved.
Rank Xerox (UK) Business Services
(3. 10/3.6/3.3. 1)
EP 0 551 523 A1
FIG.
1
MAGNETIC FIELD (T)
2
EP 0 551 523 A1
Technical Field
5
The present invention relates to a method of preparing a bismuth oxide superconducting wire, and more
particularly, it relates to a method of preparing a bismuth oxide superconducting wire which comprises the
steps of charging a metal sheath with a bismuth oxide superconductor or a raw material therefor, then
plastic-working this metal sheath into a wire and heat treating the same.
Background Art
io
75
20
25
30
35
40
45
50
55
It is known that a bismuth oxide superconductive material has a high critical temperature of about 110
K. It has been recognized that a high critical current density can be obtained by covering such a bismuth
oxide superconductive material with a metal and plastic-working the same in this state into a thin tape and
then heat treating this tape. It has also been recognized that the critical current density can be further
increased by repeating the plastic working and the heat treatment a plurality of times, in particular.
It is known that bismuth oxide superconductors include that having a critical temperature of 110 K and
those having critical temperatures of 80 K and 10 K. It is also known that non-superconducting phases
partially appear particularly when a superconductor of a 110 K phase is to be prepared.
In relation to such bismuth oxide superconductors, it is further known that the aforementioned 110 K
phase is provided by a 2223 phase containing Bi or (Bi, Pb), Sr, Ca and Cu in composition ratios of about
2:2:2:3, and the 80 K phase is provided by a 2212 phase containing such components in composition ratios
of about 2:2:1:2.
In order to employ a bismuth oxide superconductor in a high magnetic field with a cooling medium of
low-priced liquid nitrogen (77.3 K), therefore, it is necessary to generate pinning points in the largest
possible amount while maximizing the content of the 2223 phase, being the 110 K phase.
Disclosure of the Invention
Accordingly, an object of the present invention is to provide a method of preparing a bismuth oxide
superconducting wire which can obtain a high critical current density and a high critical current in a high
magnetic field.
Briefly stated, the present invention is adapted to employ a composition in which compositions capable
of forming pinning points to be introduced are increased with respect to a composition being as close as
possible to a 2223 phase being a 110 K phase for introducing the largest possible amount of nonsuperconducting phases exerting no bad influence on the 110 K phase while obtaining the 110 K phase,
thereby supplying high pinning strength with the non-superconducting phases.
More specifically, the present invention is directed to a method of preparing a bismuth oxide
superconducting wire which comprises the steps of charging powder of a bismuth oxide superconductor
containing Bi, Pb, Sr, Ca and Cu or a raw material therefor in a metal sheath, plastic-working the said metal
sheath being charged with the said powder into a wire, then performing a primary heat treatment,
performing plastic working or pressing, and further performing a secondary heat treatment, and in order to
solve the aforementioned technical problem, it comprises the following structure:
Namely, the present invention is characterized in that the powder to be charged is prepared from
powder having a composition in which the contents of Sr, Ca and Cu are increased so that an Sr-Ca-Cu-0
phase is finally precipitated in addition to a phase of (Bi22_x, Pbx)Sr2Ca2Cu3 (x = 0.3 to 0.4).
The non-superconducting deposition phase is preferably composed of (Ca0.8, Sr02)2CuO3, (Ca0.5, Sr0.5)Cu02 or (Ca0.5, Sro^CusOs, and the best composition may be (Ca0.8, Sr02)2CuO3, as described in the
following Example.
It is preferable that the total time of the primary and secondary heat treatments is 100 to 300 hours and
the powder which is charged in the metal sheath is not more than 2.0 urn in maximum particle diameter
and not more than 1.0 urn in mean particle diameter.
The bismuth oxide superconductor or the raw material therefor employed in the present invention is
generally a polycrystalline substance, which is made of an aggregate of superconducting and nonsuperconducting phases.
Further, the material for the metal sheath employed in the present invention is preferably prepared from
a metal or an alloy which is non-reactive with the bismuth oxide superconductor and of low electrical
resistance, such as silver or a silver alloy, for example.
The charged powder employed in the present invention generates 110 K phases by the heat
treatments, and disperses non-superconducting phases, mainly Ca-Sr-Cu-0 phases, among the 110 K
3
EP 0 551 523 A1
5
io
is
20
phases, to make these phases serve as pinning points.
In order to obtain a high critical current density under the liquid nitrogen temperature (77 K) in a high
magnetic field, it is necessary to introduce pinning points into the superconductor. However, it is relatively
difficult to generate a Bi-based high-temperature phase which is composed of five elements (excluding
oxygen), and hence it is extremely difficult to add elements other than the five elements in consideration of
reactivity of the five elements and generation of a high-temperature phase. Thus, it is difficult to introduce
pinning points with elements other than the five elements.
While it is known at present that foreign phases inevitably remain when a Bi-based high-temperature
phase to be is prepared, the feature of the present invention resides in an attempt to positively make the
same serve as pinning points. As to the residual foreign phases, a Bi superconductor which is composed of
five elements contains various types of such foreign phases, while the inventors have independently
investigated the compositions of such foreign phases, to find that the compositions are (Ca0.8,Sr0.2)2CuO3,
(Ca0.5, Sr0.5)CuO2 and (Ca0.5, Sro^CusOs. Therefore, it is possible to introduce pinning points which are
non-reactive with the high-temperature phase, by increasing the compositions by these foreign phases.
Thus, a wire into which pinning points are introduced is improved in critical current density in a high
magnetic field. However, this effect is small if the amount of the pinning points is small, while the path for
the superconducting current is reduced if the amount is too large, to lower the superconducting current on
the contrary.
Brief Description of the Drawing
Fig. 1 illustrates magnetic field characteristics of critical current densities of respective wires obtained
by Experimental Example carried out according to the present invention.
25
Best Mode for Carrying Out the Invention
Respective powder materials of Bi203, PbO, SrC03, CaC03 and CuO were weighed and mixed with
each other to have composition ratios shown in Table 1.
Table 1
30
Sr
Ca
Cu
Bi
Pb
1 (Y = 0)
1.8
0.4
2.0
2.0
3.0
2(Y = 0.2)
1.8
0.4
2.08
2.32
3.2
3(Y = 0.5)
1.8
0.4
2.2
2.8
3.5
4(Y=1.0)
1.8
0.4
2.4
3.5
4.0
5(Y=1.2)
1.8
0.4
2.48
3.92
4.2
Referring to the above Table, the sample 1 contained Bi, Pb, Sr, Ca and Cu in ratios of
0.8:0.4:2.0:2.0:3.0, while Sr, Ca and Cu were added to the composition of the sample 1 in composition ratios
of 0.4Y:1 .6Y:1 .0Y in the samples 2 to 5 to leave prescribed amounts of (Ca0.8, Sro^CuCb.
Then, the aforementioned mixed powder materials were heat treated at 800 °C for 20 hours, thereafter
pulverized, and then heat treated at 860 °C for 2 hours, to obtain powder materials for charging. These
powder materials were pulverized to be 2.0 urn in maximum particle diameter and 1.0 urn in mean particle
diameter.
The as-obtained powder materials were charged in silver pipes of 6.0 mm in outer diameter and 4.0
mm in inner diameter, which in turn were wire-drawn into diameters of 1.0 mm, then rolled into thicknesses
of 0.17 mm, and further pressed. Thereafter the samples were heat treated at 845 °C for 150 hours as
primary heat treatments respectively, thereafter again pressed, and then heat treated at 840 °C for 50 hours
as secondary heat treatments.
As to the wires obtained in the aforementioned manner, magnetic field dependencies of critical current
densities were measured under a temperature of 77.3 K respectively.
As the result, Jc-B characteristics shown in Fig. 1 were obtained. Referring to Fig. 1, the axis of
abscissas shows applied magnetic fields, and the axis of ordinates shows measured values of Jc
standardized with Jco in zero magnetic fields.
4
EP 0 551 523 A1
5
It is understood from Fig. 1 that the magnetic field characteristic of the critical current density can be
improved by applying such composition ratios that (Ca0.8,Sr0.2)2CuO3 is precipitated in addition to the 2223
phase as the powder to be charged. More specifically, the samples 2 and 3 exhibit particularly excellent
characteristics, while the sample 4 exhibits a slightly improved characteristic. When the amount of (Ca0.8,
Sr0.2)2CuO3 is too large as in the sample 5, the magnetic field characteristic of the critical current density is
rather reduced as compared with the sample 1 to which absolutely no such elements were added.
Claims
io
1.
A method of preparing a bismuth oxide superconducting wire comprising the steps of charging powder
of a bismuth oxide superconductor containing Bi, Pb, Sr, Ca and Cu or a raw material therefor in a
metal sheath, plastic-working said metal sheath being charged with said powder into a wire, then
performing a primary heat treatment, performing plastic working or pressing, and further performing a
secondary heat treatment, said powder to be charged being prepared from powder having such a
composition that the contents of Sr, Ca and Cu are increased so that an Sr-Ca-Cu-0 phase is finally
precipitated in addition to a phase of (Bi22-x. Pbx)Sr2Ca2Cu3 (x = 0.3 to 0.4).
2.
A method of preparing a bismuth oxide superconducting wire in accordance with claim 1, wherein said
Sr-Ca-Cu-0 phase contains at least one composition selected from a group of (Ca0.8, Sro^CuCb,
(Ca0.5, Sr0 5)CuO2 and (Ca0 5, Sr0.5)3Cu5O8.
3.
A method of preparing a bismuth oxide superconducting wire in accordance with claim 2, wherein said
Sr-Ca-Cu-0 phase contains (Ca0.8, Sro^CuCb.
4.
A method of preparing a bismuth oxide superconducting wire in accordance with claim 1, wherein said
powder to be charged is not more than 2.0 urn in maximum particle diameter and not more than 1.0
linn in mean particle diameter.
5.
A method of preparing a bismuth oxide superconducting wire in accordance with claim 1, wherein said
metal sheath is made of silver or a silver alloy.
is
20
25
30
35
40
45
50
55
5
EP 0 551 523 A1
FIG.
1
MAGNETIC FIELD (T)
6
INTERNATIONAL SEARCH R E P O R T
International Application No PCT/ JP9 2 / 0 0 9 3 5
I. CLASSIFICATION OF SUBJECT MATTER (if several classification symbols apply. Indicate all) '
According to International Patent Classification (IPC) or to both National Classification and IPC
I n t . CI
H01B13/00, C01G29/00, C01G1/00, C 0 4 B 3 5 / 0 0 ,
B21C1/00, B 2 1 C 9 / 0 0 / / H 0 1 B 1 2 / 0 4
II. FIELDS SEARCHED
Minimum Documentation Searched 7
Classification System i
Classification Symbols
i H01B12/00-13/00
, C01G1/00, C 0 1 G 2 9 / 0 0 ,
B
2
1
C
1
/00, B21C9/00
C
0
4
B
3
5
/
0
0
,
,
Documentation Searched other than Minimum Documentation
to the Extent that such Documents are Included in the Fields Searched 8
J i t s u y o S h i n a n Koho
Kokai J i t s u y o Shinan
Koho
1926
1971
-
1992
1992
III. DOCUMENTS CONSIDERED TO BE RELEVANT >
Citation of Document, " with indication, where appropriate, of the relevant passages 11
Category • \
A
EP, A, 356969 (Sumitomo E l e c t r i c
Ltd.),
Industries,
March 7, 1990 (07. 03. 9 0 ) ,
R e f e r to f u l l d e s c r i p t i o n s a n d
all drawings
& AU, A, 8939596 & JP, A, 3 - 1 3 8 8 2 0
A
EP, A, 379960 (Sumitomo E l e c t r i c
Industries,
Ltd.),
A u g u s t 1, 1990 (01. 08. 9 0 ) ,
R e f e r to f u l l d e s c r i p t i o n s a n d
all drawings
& JP, A, 3 - 1 1 0 7 2 1
| Relevant to Claim No. '»
1-5
j
1-5
1-5
IEEE TRANSACTIONS ON MAGNETICS,
Vol. 27, No. 2, March 1991 (31. 03. 9 1 ) ,
P. 1 2 3 1 - 1 2 3 8 , K. S a t o , T. H i k a t a ,
H. Mukai, M. Ueyama, N. S h i b u t a ,
T. K a t o , T. Masuda, M. N a g a t a ,
K. I w a t a , T. M i t s u i "HIGH- Jc SILVERSHEATHED Bi-BASED SUPERCONDUCTING
WIRES"
R e f e r to f u l l d e s c r i p t i o n s
[ and a l l d r a w i n g s
*Special categories of cited documents: 10
"T" later document published after the international filing date or
with th! ,J)pliC*.!!0n1 bUtC.',8d ,0
nt" in
"A" document defining the general state of the art which is not
pri?Wy.d8?.tnd
understand the principle,COn"l?
the Invention
or theory underlying
considered to be of particular relevance
ofparticular relevance: the claimed Invention cannot
•E" earlier document but published on or after the international "x" *Kument
^ cons,dered novel or cannot be considered to involve an
filing date
inventive step
"L document which may throw doubts on priority claim(s) or
_ne c.aimo?
.
. . . . 0.L2".rt'f ul,,r
,
, ^ inv?„n"2n
d°cumen*
c*nno
which Is cited- to establish the publication date of another
considered to Involverele"nce-,
the document
an inventive step when
citation or other special reason (as specified)
such
combined
with
other
such
documents,
one
or
more
is
"O" document referring to an oral disclosure, use. exhibition or
combination being obvious to a person skilled in the art
other means
.
.
.
.
.
"P" document published prior to the international filing date but & document member of the same patent family
later than the priority date claimed
IV. CERTIFICATION
Date of Mailing of this International Search Report
Date of the Actual Completion of the International Search
O c t o b e r 6, 1992 (06. 10. 92)
S e p t e m b e r 17, 1992 (17. 09. 92)
A
International Searching Authority
Japanese Patent
Signature of Authorized Officer
Office
Form PCT/ISA/210 (second sheet) (January 1985)
International Application No. PCT/ JP9 2 / 0 0 9 3 5
FURTHER INFORMATION CONTINUED FROM THE SECOND SHEET
P ! JP, A, 3 - 2 1 6 9 1 7 (Sumitomo E l e c t r i c
Industries,
Ltd.),
! S e p t e m b e r 24, 1991 (24. 09. 9 1 ) ,
R e f e r to f u l l d e s c r i p t i o n s and
all d r a w i n g s
(Family: none)
P
EP, A, 447994 (Sumitomo E l e c t r i c
Industries,
Ltd.),
S e p t e m b e r 25, 1991 (25. 09. 91),
R e f e r to f u l l d e s c r i p t i o n s ,
& FI, A, 9101313 & JP, A, 3 - 2 6 5 5 2 3
& JP, A, 3 - 2 8 0 3 0 8
1-5
i
i
!
1-5
j
!
V.U OBSERVATIONS WHERE CERTAIN CLAIMS WERE FOUND UNSEARCHABLE
This international search report has not been established mrespect of certain claims under Article 17(2) (a) for the following reasons:
1-1 | Claim numbers
, because thpy relate to subject matter not required to be searched by this Authority, namely:
2-1 | Claim numbers
, because they relate to parts of the international application that do not comply with the prescribed
requirements to such an extent that no meaningful international search can be carried out, specifically:
3.} | Claim numbers
, because they are dependent claims and are not drafted in accordance with the second and third
sentences of PCT Rule 6.4(a).
VI.□ OBSERVATIONS WHERE UNITY OF INVENTION IS LACKING 2
This International Searching Authority found multiple inventions in this international application as follows:
j I As all required additional search fees were timely paid by the applicant, this international search report covers all searchable
riaimc of
nt the
tho international
intArnatinnal application.
annlii>9lirin
claims
2.|j Asonly some of the required additional search fees were timely paid by the applicant, this international search report covers only
those claims of the international application for which fees were paid, specifically claims:
3.| | Norequired additional search fees were timely paid bythe applicant. Consequently, this international search report is restricted to
the invention first mentioned in the claims; it is covered by claim numbers:
4.| j As all searchable claims could be searched without effort justifying an additional fee, the International Searching Authority did not
invite payment of any additional fee.
Remark on Protest
~
| ~] The additional search fees were accompanied by applicant's protest.
| j No protest accompanied the payment of additional search fees.
Form PCT/ISA/210 (supplemental sheet (2)) (January 1385)
nternational Application No. P C T / J P 9 2 / 0 0 9 3 5
FURTHER INFORMATION CONTINUED FROM THE SECOND SHEET
EP, A, 449161 (Sumitomo E l e c t r i c
Ltd.),
Industries,
O c t o b e r 2, 1991 (02. 10. 9 1 ) ,
R e f e r to f u l l d e s c r i p t i o n s
& FI, A, 9101475 & JP, A, 4 - 2 1 2 2 1 5
EP, A, 450443 ( G e n e r a l E l e c t r i c C o . ) ,
O c t o b e r 9, 1991 (09. 10. 9 1 ) ,
R e f e r to f u l l d e s c r i p t i o n s
& CA, A, 2034339 & JP, A, 4 - 2 2 3 0 1 0
1-b
JP, A, 4-1002 (Sumitomo E l e c t r i c
Ltd.),
Industries,
J a n u a r y 6, 1992 (06. 01. 9 2 ) ,
1-5
V□ OBSERVATIONS WHERE CERTAIN CLAIMS WERE FOUND UNSEARCHABLE '
rhis international search report has not been established in respect of certain claims under Article 17(21 lal for the following reasons:
1.1 [ Claim numbers
. because they relate to subject matter not required to be searched by this Authority, namely:
Z.rj Claim numbers
, because they relate to parts of the international application that do not comply with the prescribed
requirements to such an extent that no meaningful international search can be carried out. specifically:
3.| | Claim numbers
, because they are dependent claims and are not drafted in accordance with the second and third
sentences of PCT Rule 6.4(al.
VI.□ OBSERVATIONS WHERE UNITY OF INVENTION IS LACKING 2
This International Searching Authority found multiple inventions in this international application as follows:
1.| | As all required additional search fees were timely paid by the applicant, this international search report covers all searchable
claims of the international application.
2.| | As only some of the required additional search fees were timely paid by the applicant, this international search report covers only
those claims of the international application for which fees were paid, specifically claims:
3.| | Norequired additional search fees were timely paid by the applicant. Consequently, this international search report is restricted to
the invention first mentioned in the claims; it is covered by claim numbers:
4.| | As all searchable claims could be searched without effort justifying an additional fee, the International Searching Authority did not
invite payment of any additional fee.
Remark on Protest
| j The additional search fees were accompanied by applicant's protest.
j | No protest accompanied the payment of additional search fees.
Form PCT/1SA/210 (supplemental sheet (2)) (January 19851
International Application No. P C T / J P 9 2 / 009 35
FURTHER INFORMATION CONTINUED FROM THE SECOND SHEET
I Refer
to f u l l d e s c r i p t i o n s
(Family: none)
JP, A, 4-12413 (Sumitomo E l e c t r i c
Industries,
Ltd.),
J a n u a r y 17, 1992 (17. 01. 9 2 ) ,
R e f e r to f u l l d e s c r i p t i o n s
(Family: none)
1-5
EP, A, 467238 (Sumitomo E l e c t r i c
Industries,
Ltd.),
J a n u a r y 22, 1992 (22. 01. 9 2 ) ,
R e f e r to f u l l d e s c r i p t i o n s ,
& AU, A, 9180310 & CA, A, 2 0 4 6 5 3 6
& JP, A, 4 - 7 3 8 2 2
vO OBSERVATIONS WHERE CERTAIN CLAIMS WERE FOUND UNSEARCHABLE
1-5
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1| j Claim numbers
, because thpy relate to subject matter not required to be searched by this Authority, namely:
2.j ) Claim numbers
, because they relate to parts of the international application that do not comply with the prescribed
requirements to such an extent that no meaningful international search can be carried out, specifically:
3.| ) Claim numbers
, because they are dependent claims and are not drafted in accordance with the second and third
sentences of PCT Rule 6.4(al.
VI.□OBSERVATIONS WHERE UNITY OF INVENTION IS LACKING :
This international Searching Authority found multiple inventions in this international application as follows:
l .j | As all required additional search fees were timely paid by the applicant, this international search report covers all searchable
claims of the international application.
2.j | As only some of the required additional search fees were timely paid by the applicant, this international search report covers only
those claims of the international application for which fees were paid, specifically claims:
3.| j Norequired additional search fees were timely paid by the applicant. Consequently, this international search report is restricted to
the invention first mentioned in the claims; it is covered by claim numbers:
4.| | As all searchable claims could be searched without effort justifying an additional fee, the International Searching Authority did not
invite payment of any additional fee.
Remark on Protest
f"~~] The additional search fees were accompanied by applicant's protest.
| | No protest accompanied the payment of additional search fees.
Form PCT/ISA/210 (supplemental sheet (21) (January 1985)
International Application No. PCT / JP 9 2 / 0 0 9 3 5
FURTHER INFORMATION CONTINUED FROM THE SECOND SHEET
EP, A, 470595 (Sumitomo E l e c t r i c
Industries,
Ltd.),
F e b r u a r y 12, 1992 (12. 02. 9 2 ) ,
R e f e r to f u l l d e s c r i p t i o n s ,
& FI, A, 9103750 & JP, A, 4 - 9 4 0 1 9
1-5
JP, A, 4-48518 (Sumitomo E l e c t r i c
Industries,
Ltd.),
F e b r u a r y 18, 1992 (18. 02. 9 2 ) ,
R e f e r to f u l l d e s c r i p t i o n s
(Family: none)
1-5
JP, A, 4-65034 (Sumitomo
Industries,
Ltd.),
1-5
Electric
V£j OBSERVATIONS WHERE CERTAIN CLAIMS WERE FOUND UNSEARCHABLE
This international search report has not been established in respect of certain claims under Article 17(2) (a) for the following reasons:
1-| | Claim numbers
, because they relate to subject matter not required to be searched by this Authority, namely:
2.j j Claim numbers
, because they relate to parts of the international application that do not comply with the prescribed
requirements to such an extent that no meaningful international search can be carried out, specifically:
3.| | Claim numbers
, because they are dependent claims and are not drafted in accordance with the second and third
sentences of PCT Rule 6.4(a).
VIFI OBSERVATIONS WHERE UNITY OF INVENTION IS LACKING 2
This International Searching Authority found multiple inventions in this international application as follows:
1.( | As all required additional search fees were timely paid by the applicant, this international search report covers all searchable
claims of the international application.
2.[ ) Asonly some of the required additional search fees were timely paid by the applicant, this international search report covers only
those claims of the international application for which fees were paid, specifically claims:
3.( | Norequired additional search fees were timely paid by the applicant. Consequently, this international search report is restricted to
the invention first mentioned in the claims; it is covered by claim numbers:
4.( j As all searchable claims could be searched without effort justifying an additional fee, the International Searching Authority did not
invite payment of any additional fee.
Remark on Protest
j | The additional search fees were accompanied by applicant's protest.
| | No protest accompanied the payment of additional search fees.
Form PCT/ISA/210 (supplemental sheet (2)) (January 19851
International Application No. PCT/ JP9 2 / 0 0 9 3 5
FURTHER INFORMATION CONTINUED FROM THE SECOND SHEET
March 2, 1992 (02. 03. 92) ,
R e f e r to f u l l d e s c r i p t i o n s a n d
all drawings
(Family: none)
JP, A, 4-123718
(Sumitomo E l e c t r i c
Industries,
Ltd.),
A p r i l 23, 1992 (23. 04. 9 2 ) ,
R e f e r to f u l l d e s c r i p t i o n s
(Family: none)
1-5
JP, A, 4 - 2 3 7 9 1 0 (Sumitomo E l e c t r i c
Industries,
L t d . )) ,,
A u g u s t 26, 1992 (26. 08. 92)
R e f e r to f u l l d e s c r i p t i o n s
v LJ OBSERVATIONS WHERE CERTAIN CLAIMS WERE FOUND UNSEARCHABLE
1-5
This international search report has not been established in respect of certain claims under Article 17(2) (a) for the following reasons:
1-j I Claim numbers
. because they relate to subject matter not required to be searched by this Authority, namely:
2.( | Claim numbers
, because they relate to parts of the international application that do not comply with the prescribed
requirements to such an extent that no meaningful international search can be earned out. specifically:
3.| | Claim numbers
. because they are dependent claims and are not drafted in accordance with the second and third
sentences of PCT Rule 6.4(a).
VI.□OBSERVATIONS WHERE UNITY OF INVENTION IS LACKING :
This International Searching Authority found multiple inventions in this international application as follows:
1.| j As all required additional search fees were timely paid by the applicant, this international search report covers all searchable
claims of the international application.
2.| | Asonly some of the required additional search fees were timely paid by the applicant, this international search report covers only
those claims of the international application for which fees were paid, specifically claims:
3.[ | Norequired additional search fees were timely paid by the applicant. Consequently, this international search report is restricted to
the invention first mentioned in the claims; it is covered by claim numbers:
4.( | Asall searchable claims could be searched without effort justifying an additional fee, the International Searching Authority did not
invite payment of any additional fee.
Remark on Protest
[ | The additional search fees were accompanied by applicant's protest.
j j No protest accompanied the payment of additional search fees.
Form PCT/1SA/210 (supplemental sheet (2)) (January 1985)