US2586168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of hardening gelatin and photographic gelatin emulsions
Assignee: GAF Chemicals Corp
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Filing: 1947-07-11
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Granted: 1952-02-19
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Expires: 1967-07-11
Abstract
No abstract record available.
Inventors
- 👤 Frank J Kaszuba
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: 4
Claim 1
Independent Claim
38 words
THE METHOD OF PRODUCING A HARDENED GELATIN LAYER IN A PHOTOGRAPHIC SILVER-HALIDE ELEMENT HAVING NO AFTER-HARDENING TENDENCY WHICH COMPRISES UNIFORMLY MIXING THEREWITH, PRIOR TO COATING UPON A SUPPORT, A DIMETHYLOL-DIKETOPIPERAZINE HARDENING AGENT CHARACTERIZED BY THE FOLLOWING GENREAL FORMULA:
Claim 2
Independent Claim
38 words
THE METHOD OF PRODUCING A HARDENED GELATIN LAYER IN A PHOTOGRAPHIC SILVER-HALIDE ELEMENT HAVING NO AFTER-HARDENING TENDENCY WHICH COMPRISES UNIFORMLY MIXING THEREWITH, PRIOR TO COATING UPON A SUPPORT, A DIMETHYLOL-DIKETOPIPERAZINE HARDENING AGENT CHARACTERIZED BY THE FOLLOWING GENREAL FORMULA:
Claim 3
Independent Claim
41 words
THE METHOD OF PRODUCING A HARDENED GELATIN LAYER IN A PHOTOGRAPHIC SILVER-HALIDE ELEMENT HAVING NO AFTER-HARDENING TENDENCY WHICH COMPRISES UNIFORMLY MIXING THEREWITH, PRIOR TO COATING UPON A SUPPORT, 2,4-DIHYDROXY BENZALDEHYDE AND A DIMETHYLOL-DIKETOPIPERAZINE HARDENING AGENT CHARACTERIZED BY THE FOLLOWING GENERAL FORMULA:
Claim 4
Independent Claim
41 words
THE METHOD OF PRODUCING A HARDENED GELATIN LAYER IN A PHOTOGRAPHIC SILVER-HALIDE ELEMENT HAVING NO AFTER-HARDENING TENDENCY WHICH COMPRISES UNIFORMLY MIXING THEREWITH, PRIOR TO COATING UPON A SUPPORT, 2,4-DIHYDROXY BENZALDEHYDE AND A DIMETHYLOL-DIKETOPIPERAZINE HARDENING AGENT CHARACTERIZED BY THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
US2165421A
Cited
US2422680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-18 | 1955-08-20 | 1956-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-18 | 1959-08-20 | 1960-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-18 | 1963-08-20 | 1964-02-19 | $7700.00 | Window Closed / Lapsed |