Patent US2723197A successfully refreshed from Google Patents.
US2723197A
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Silver halide emulsions for black and white prints containing brightening agents
Assignee: GAF Chemicals Corp
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Filing: 1951-03-23
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Granted: 1955-11-08
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Expires: 1971-03-23
Abstract
No abstract record available.
Inventors
- 👤 William H Libby
- 👤 Harlan B Freyermuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:26
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/815; G03C1/8155; Y; Y10; Y10S; Y10S430/00; Y10S430/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A LIGHT SENSITIVE PHOTOGRAPHIC EMULSION FOR FORMING BLACK AND WHITE IMAGES THEREIN COMPRISING A SUPPORT AND A LIGHT SENSITIVE SILVER HALIDE EMULSION LAYER CONTAINING, IN A BRIGHTENING AMOUNT, A BRIGHTENING AGENT CAPABLE OF BRIGHTENING THE WHITE PORTIONS OF THE SILVER IMAGE FORMED AFTER EXPOSURE AND DEVELOPMENT OF SAID EMULSION, CHARACTERIZED BY THE FOLLOWING GENERAL FORMULD:
Claim 2
Dependent Claim
55 words
A LIGHT SENSITIVE PHOTOGRAPHIC EMULSION FOR FORMING BLACK AND WHITE IMAGES THEREIN COMPRISING A SUPPORT AND A LIGHT SENSITIVE SILVER HALIDE EMULSION LAYER CONTAINING, IN A BRIGHTENING AMOUNT, A BRIGHTENING AGENT CAPABLE OF BRIGHTENING THE WHITE PORTIONS OF THE SILVER IMAGE FORMED AFTER EXPOSURE AND DEVELOPMENT OF SAID EMULSION, CHARACTERIZED BY THE FOLLOWING GENERAL FORMULD:
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) | 1958-11-07 | 1959-05-09 | 1959-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-07 | 1963-05-09 | 1963-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-07 | 1967-05-09 | 1967-11-08 | $7700.00 | Window Closed / Lapsed |