Patent US2988873A successfully refreshed from Google Patents.
Patent US2673149A successfully refreshed from Google Patents.
US2673149A
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Quaternary salts in mixed grain photographic emulsions
Assignee: Eastman Kodak Co
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Filing: 1951-10-17
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Granted: 1954-03-23
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Expires: 1971-10-17
Abstract
No abstract record available.
Inventors
- 👤 Burt H Carroll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:03
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/102
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A MIXED GRAIN PHOTOGRAPHIC EMULSION CONTAINING AT LEAST TWO SETS OF SILVER HALIDE GRAINS SENSITIVE TO DIFFERENT SPECTRAL REGIONS, AT LEAST ONE OF SAID SETS OF GRAINS BEING SENSITIZED WITH A CYANINE SENSITIZING DYE AND AT LEAST ONE OF SAID SETS OF GRAINS HAVING ADSORBED THERETO A QUATERNARY SALT OF THE STRUCTURE:
Claim 2
Dependent Claim
52 words
A MIXED GRAIN PHOTOGRAPHIC EMULSION CONTAINING AT LEAST TWO SETS OF SILVER HALIDE GRAINS SENSITIVE TO DIFFERENT SPECTRAL REGIONS, AT LEAST ONE OF SAID SETS OF GRAINS BEING SENSITIZED WITH A CYANINE SENSITIZING DYE AND AT LEAST ONE OF SAID SETS OF GRAINS HAVING ADSORBED THERETO A QUATERNARY SALT OF THE STRUCTURE:
References Cited (Backward Citations)
US2288226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |