Patent US4427768A successfully refreshed from Google Patents.
US4427768A
Expired / Lapsed
US
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Method of hardening gelatin
Assignee: Fujifilm Holdings Corp
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Filing: 1982-07-02
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Granted: 1984-01-24
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Expires: 2002-07-02
Abstract
Abstract A method of hardening gelatin is described comprising treating gelatin with a compound of the formula (I) ##STR1## wherein R 1 and R 2 can each represent a monovalent group including a carbon atom or a nitrogen atom forming a bond together with the nitrogen atom N forming an acid ester in the formula (I); or R 1 and R 2 together can form a heterocyclic ring together with said nitrogen atom N, and n is 1 or 2; and when n is 1, X is ##STR2## and Y is an alkyl group, an aryl group or an aralkyl group; and when n is 2, X is ##STR3##
Inventors
- 👤 Katuji Kitatani
- 👤 Hidefumi Sera
- 👤 Atsuaki Arai
- 👤 Masasi Ogawa
- 👤 Kunio Ishigaki
- 👤 Haruo Ogura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:41
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/48; C07D207/00; C07D207/46; C07D209/52; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
149 words
A silver halide photographic light-sensitive material comprising at least one gelatin-containing layer hardened by a hardening agent of the formula (I) ##STR9## wherein R 1 and R 2 each represent a monovalent group including a carbon atom or a nitrogen atom forming a bond together with the nitrogen atom N in the formula (I), the total number of carbon atoms in said monovalent groups being 4 or 5 carbon atoms; or R 1 and R 2 together form a heterocyclic ring which can contain an oxygen atom together with said nitrogen atom N, and n is 1 or 2; and when n is 1, X is ##STR10## and Y is an alkyl group, having from 1 to 8 carbon atoms, an aryl group having from 6 to 12 carbon atoms or an aralkyl group having from 7 to 13 carbon atoms; and when n is 2, X is ##STR11##
Claim 2
Dependent Claim
149 words
A silver halide photographic light-sensitive material comprising at least one gelatin-containing layer hardened by a hardening agent of the formula (I) ##STR9## wherein R 1 and R 2 each represent a monovalent group including a carbon atom or a nitrogen atom forming a bond together with the nitrogen atom N in the formula (I), the total number of carbon atoms in said monovalent groups being 4 or 5 carbon atoms; or R 1 and R 2 together form a heterocyclic ring which can contain an oxygen atom together with said nitrogen atom N, and n is 1 or 2; and when n is 1, X is ##STR10## and Y is an alkyl group, having from 1 to 8 carbon atoms, an aryl group having from 6 to 12 carbon atoms or an aralkyl group having from 7 to 13 carbon atoms; and when n is 2, X is ##STR11##
Claim 3
Dependent Claim
30 words
A silver halide photographic light-sensitive material as in claim 1 wherein R 1 or R 2 together form a 5- or 6-membered heterocyclic ring together with said nitrogen atom N.
Claim 4
Dependent Claim
16 words
A silver halide photographic light-sensitive material as in claim 1 or 2, wherein n is 2.
Claim 5
Dependent Claim
16 words
A silver halide photographic light-sensitive material as in claim 1, or 2, wherein n is 1.
Claim 6
Dependent Claim
39 words
A silver halide photographic light-sensitive material as in claim 1 wherein the hardening agent of the formula (I) is used in an amount of from about 0.1% to about 20% by weight based on the weight of dry gelatin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |