US2629659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of hardening gelatino silver halide emulsions
Assignee: GAF Chemicals Corp
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Filing: 1948-12-07
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Granted: 1953-02-24
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Expires: 1968-12-07
Abstract
No abstract record available.
Inventors
- 👤 Fritz W H Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:34
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
A PHOTO-SENSITIVE ELEMENT COMPRISING A SUPPORT AND A GELATINO SILVER-HALIDE EMULSION COATED THEREON, SAID EMULSION CONTAINING AS HARDENING MEANS, 2,4-DIHYDROXYBENZALDEHYDE, RESORCINOL, AND A KETO ALCOHOL CHARACTERIZED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
31 words
A PHOTO-SENSITIVE ELEMENT COMPRISING A SUPPORT AND A GELATINO SILVER-HALIDE EMULSION COATED THEREON, SAID EMULSION CONTAINING AS HARDENING MEANS, 2,4-DIHYDROXYBENZALDEHYDE, RESORCINOL, AND A KETO ALCOHOL CHARACTERIZED BY THE FOLLOWING GENERAL FORMULA:
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) | 1956-02-24 | 1956-08-25 | 1957-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-24 | 1960-08-25 | 1961-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-24 | 1964-08-25 | 1965-02-24 | $7700.00 | Window Closed / Lapsed |