US2612446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic elements having a light-sensitive silver halide layer and a stripping layer composed of a polyvinyl pyridine quaternary salt and process of using such elements
Assignee: EIDP Inc
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Filing: 1949-09-15
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Granted: 1952-09-30
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Expires: 1969-09-15
Abstract
No abstract record available.
Inventors
- 👤 Umberger Jacob Quentin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:44
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/805; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
47 words
A PHOTOGRAPHIC STRIPPING FILM COMPRISING A HYDROPHOBIC FLEXIBLE SUPPORT, A HYDROPHILIC COLLOID SILVER HALIDE EMULSION LAYER ON THE SUPPORT, A LAYER COMPOSED ESSENTIALLY OF WATER-SOLUBLE QUATERNARY SALT OF A VINYLPYRIDINE POLYMER ON SAID EMULSION LAYER AND A LIGHT-SENSITIVE COLLOID SILVER HALIDE EMULSION LAYER ON SAID POLYMER LAYER.
Claim 2
Dependent Claim
47 words
A PHOTOGRAPHIC STRIPPING FILM COMPRISING A HYDROPHOBIC FLEXIBLE SUPPORT, A HYDROPHILIC COLLOID SILVER HALIDE EMULSION LAYER ON THE SUPPORT, A LAYER COMPOSED ESSENTIALLY OF WATER-SOLUBLE QUATERNARY SALT OF A VINYLPYRIDINE POLYMER ON SAID EMULSION LAYER AND A LIGHT-SENSITIVE COLLOID SILVER HALIDE EMULSION LAYER ON SAID POLYMER LAYER.
Claim 3
Dependent Claim
66 words
A PROCESS FOR DECREASING THE WATER-SOLUBILITY OF A STRIPPING LAYER OF A PHOTOGRAPHIC ELEMENT, SAID STRIPPING LAYER SUPPORTING A HYDROPHILIC COLLOID SILVER HALIDE EMULSION LAYER AND CONSISTING ESSENTIALLY OF A WATER-SOLUBLE QUATERNARY SALT OF A VINYLPYRIDINE POLYMER, WHICH COMPRISES TREATING SAID SALT WITH AN AQUEOUS SOLUTION CONTAINING AN ANIONIC WETTING AGENT WHEREIN THE HYDROPHOBIC GROUP IS AN ALIPHATIC HYDROCARBON RADICAL OF 10 TO 18 CARBON ATOMS.
Claim 4
Dependent Claim
66 words
A PROCESS FOR DECREASING THE WATER-SOLUBILITY OF A STRIPPING LAYER OF A PHOTOGRAPHIC ELEMENT, SAID STRIPPING LAYER SUPPORTING A HYDROPHILIC COLLOID SILVER HALIDE EMULSION LAYER AND CONSISTING ESSENTIALLY OF A WATER-SOLUBLE QUATERNARY SALT OF A VINYLPYRIDINE POLYMER, WHICH COMPRISES TREATING SAID SALT WITH AN AQUEOUS SOLUTION CONTAINING AN ANIONIC WETTING AGENT WHEREIN THE HYDROPHOBIC GROUP IS AN ALIPHATIC HYDROCARBON RADICAL OF 10 TO 18 CARBON ATOMS.
References Cited (Backward Citations)
US2487829A
Cited
US2448552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-30 | 1956-03-31 | 1956-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-30 | 1960-03-31 | 1960-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-30 | 1964-03-31 | 1964-09-30 | $7700.00 | Window Closed / Lapsed |