US4456676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amine stabilizers for wash-off systems
Assignee: EIDP Inc
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Filing: 1983-06-10
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Granted: 1984-06-26
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Expires: 2003-06-10
Abstract
Abstract Amine compounds or metal-ammine complexes incorporated into developer-incorporated wash-off films stabilize against premature gelatin hardening on aging. Preferred additives are two gelatin amino acids, lysine and arginine.
Inventors
- 👤 James M. Ciskowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:44
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/315
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
117 words
A process of producing an image on a photosensitive wash-off film by tanning development, which process consists essentially of imagewise exposing said film, developing the exposed film in an alkali-activating bath having a pH of at least 9, and thereafter washing off the nonhardened areas with warm water, said photosensitive wash-off film consisting of a support, an unhardened or only slightly hardened gelatin-containing silver halide emulsion layer and an auxiliary layer on said support, and wherein the gelatin constituent tends to become water-insoluble and to bind to the support during storage, characterized in that a stabilizing amount of an amino acid or amine-containing polymer is incorporated into the silver halide emulsion layer or into an auxiliary layer.
Claim 2
Dependent Claim
117 words
A process of producing an image on a photosensitive wash-off film by tanning development, which process consists essentially of imagewise exposing said film, developing the exposed film in an alkali-activating bath having a pH of at least 9, and thereafter washing off the nonhardened areas with warm water, said photosensitive wash-off film consisting of a support, an unhardened or only slightly hardened gelatin-containing silver halide emulsion layer and an auxiliary layer on said support, and wherein the gelatin constituent tends to become water-insoluble and to bind to the support during storage, characterized in that a stabilizing amount of an amino acid or amine-containing polymer is incorporated into the silver halide emulsion layer or into an auxiliary layer.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the amino acid is arginine or lysine.
Claim 4
Dependent Claim
27 words
The process of claim 1 wherein the amino acid or amine-containing polymer is added in the amount of from 4 to 21% by weight of the gelatin.
References Cited (Backward Citations)
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US3293035A
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US3615529A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |