US3212899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide emulsions sensitized with quaternary ammonium salt and developer combinations
Assignee: Eastman Kodak Co
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Filing: 1961-08-17
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Granted: 1965-10-19
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Expires: 1981-08-17
Abstract
No abstract record available.
Inventors
- 👤 Kenneth C Kennard
- 👤 Frederick J Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:45
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
39 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION CONTAINING A SENSITIZING AMOUNT OF SENSITIZER COMBINATION COMPRISING: (A) A QUARTERNARY AMMONIUM SALT SILVER HALIDE CHEMICAL SENSITIZER; AND (B) A HYDROQUINONE SILVER HALIDE DEVLOPING AGENT AND A COMPOUND CAPABLE OF FORMING A BISULFITE ION..
Claim 2
Dependent Claim
39 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION CONTAINING A SENSITIZING AMOUNT OF SENSITIZER COMBINATION COMPRISING: (A) A QUARTERNARY AMMONIUM SALT SILVER HALIDE CHEMICAL SENSITIZER; AND (B) A HYDROQUINONE SILVER HALIDE DEVLOPING AGENT AND A COMPOUND CAPABLE OF FORMING A BISULFITE ION..
Claim 3
Dependent Claim
45 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION CONTAINING A SENSITIZING AMOUNT OF A COMBINATION COMPRISING: (A) A QUARTERNARY AMMONIUM SALT SILVER HALIDE CHEMICALA SENSITIZER, (B) A 3-PYRAZOLIDONE SILVER HALIDE DEVELOPING AGENT, AND (C) A HYDROQUINONE SILVER HALIDE AGENT AND A COMPOUND CAPABLE OF FORMING A BISULFITE ION.
Claim 4
Dependent Claim
45 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION CONTAINING A SENSITIZING AMOUNT OF A COMBINATION COMPRISING: (A) A QUARTERNARY AMMONIUM SALT SILVER HALIDE CHEMICALA SENSITIZER, (B) A 3-PYRAZOLIDONE SILVER HALIDE DEVELOPING AGENT, AND (C) A HYDROQUINONE SILVER HALIDE AGENT AND A COMPOUND CAPABLE OF FORMING A BISULFITE ION.
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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |