Patentamt
Office
J E u r o p European
a i s c h e Patent
s
]]) Publication number
PATENT
EUROPEAN
APPLICATION
© Int. CI.4: C 09 B 7 / 0 2
C 09 K 5 / 0 0
© Application number: 83100708.3
© Date of filing: 26.01.83
© Priority: 29.01.82 JP 13910/82
@ |nventor: Setsune( Junjchiro
346-6, Hishiki
Sakai-shi(JP)
^ Date of publication of application:
(43)
10.08.83 Bulletin 83/32
^(88; Date of deferred publication of search report: 02.05.85
® Designated Contracting States:
DE FR GB
© Applicant: Matsushita Electric Industrial Co., Ltd.
1006, Oaza Kadoma
Kadoma-shiOsaka-fu,571(JP)
© Inventor: Kitao, Teijiro
23, Aobagaoka
Tondabayashi-shi(JP)
085
A3
Office europeen des brevets
©
0
(g) Inventor: Ishihara, Shoichi
34-8, Amanogahara-1-chome
Katano-shi(JP)
@ Inventor: Yamamoto, Ryoichi
2-4, Naritaminamimachi
Neyagawa-shi(JP)
^ Representative: Patentanwalte Leinweber &
V*)
Zimmermann
Rosental 7/II Aufg.
D-8000 Munchen 2(DE)
(54) Sunlight-energy-storing substances and sunlight-energy-storing method using the same.
© This invention is firstly an indigo derivative soluble in
water and/or an alcohol, and secondly a method for storing
light energy using the aforesaid indigo derivative. Among
indigo derivatives capable of storing light energy by the
photoisomerization of the molecule from the frans-form to
the c/s-form, compounds heretofore obtained have been
soluble only in expensive solvents such as benzene, toluene,
chloroform, carbon tetrachloride and the like and harmful
substances.
On the other hand, the indigo derivative of this invention
has the form of a pyridinium salt, is soluble in water and/or
ethanoi, and permits employment of safe and inexpensive
water and/or an alcohol as a solvent.
The indigo derivative of this invention converted from
the trans-form to the c/s-form by irradiation with sunlight
and storing sunlight energy liberates the aforesaid stored
energy as heat on addition of a catalyst and/or a heat trigger.
Croydon Printing Company Ltd
3 9 2
0 0 8 5 3 9 2
European raiem
Office
Application number
EUROPEAN SEARCH R E P O R T
EP
UUCUMCN 1S CONSIDERED TO BE RELEVANT
wtiauun ui uuuumeni wnn indication, wnere appropriate,
of relevant passages
Ub-A-4 XUO U14 (R. SCHWERZEL)
* Claims
1-8;
columns
8,9 X
Heievant
to claim
83
10
0708
CLASSIFICATION OF THE
APPLICATION (Int. Cl ')
C 09
C 09
B 7/02
K 5/00
Ub-A-4 UU4 b / 2
(R.NATHAN)
* Claims
1-13 *
Ub-A-4 UU 4 b / j
* Claims 1-13;
(D. F R I E L I N G )
columns
13,18
X
U S - A - J 1UU 739
( W. K A I S E R )
* Claim;
c o l u m n 3, l i n e s
10-15;
c o l u m n 9 , No . 4 7 *
TECHNICAL FIELDS
SEARCHED (Int. CI. 3)
C 09
C 09
B 01
B
K
J
iiic (jicacmacaiLii iepun nas oeen arawn up lor an claims
Place of search
Date of completion of the search
Examiner
THE HAGUE
12-12-1984
DELANGHE
'
—
— 1
:
__
UMieiaUHT ui- UlltUUUUUMbNTb
I : theory or principle underlying the invention
: : earlier patent document, but published on. or
C: particularly relevant if taken alone
after the filing date
f : particularly relevant if combined with another
3 : document cited in the application
document of the same category
. : document cited for other reasons
^ : technological background
) : non-written disclosure
nemberof the same patent family, corresponding
' : intermediate document
iocument
I
j
1