US2976152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic gelatin layers containing triazine hardeners
Assignee: GAF Chemicals Corp
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Filing: 1958-12-19
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Granted: 1961-03-21
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Expires: 1978-12-19
Abstract
No abstract record available.
Inventors
- 👤 Harold A Levine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:36
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/30; G03C1/305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
THE METHOD OF PRODUCING A HARDENED GELATIN LAYER IN A PHOTOGRAPHIC SILVER HALIDE ELEMENT WHICH COMPRISES UNIFORMLY MIXING WITH THE AQUEOUS GELATIN DISPERSION USED IN THE PERPARATION OF SAID LAYER, PRIOR TO COATING UPON A SUPPORT, A HARDENING AMOUNT OF 1,3,5-TRIS-(HALOGENOACETYL)PERHYDRO-1,3,5-TRIAZINE HARDENING AGENT SELECTED FROM THE GROUP OF COMPOUNDS HAVING THE FOLLOWING GENERAL FORMULA:
Claim 2
Independent Claim
54 words
THE METHOD OF PRODUCING A HARDENED GELATIN LAYER IN A PHOTOGRAPHIC SILVER HALIDE ELEMENT WHICH COMPRISES UNIFORMLY MIXING WITH THE AQUEOUS GELATIN DISPERSION USED IN THE PERPARATION OF SAID LAYER, PRIOR TO COATING UPON A SUPPORT, A HARDENING AMOUNT OF 1,3,5-TRIS-(HALOGENOACETYL)PERHYDRO-1,3,5-TRIAZINE HARDENING AGENT SELECTED FROM THE GROUP OF COMPOUNDS HAVING 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) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |