US3734738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide emulsions containing reactive quaternary salts nucleating agents
Assignee: Eastman Kodak Co
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Filing: 1970-10-30
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Granted: 1973-05-22
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Expires: 1990-10-30
Abstract
Abstract REACTIVE N-SUBSTITUTED, CYCLOAMMONIUM QUATERNARY SALTS, WHEREIN THE N-SUBSTITUENT INCLUDES ALKYL RADICALS WHOSE TERMINAL CARBON ATOM IS ADDITIONALLY SUBSTITUTED WITH AN ACYL RADICAL SUCH AS A FORMYL RADICAL, AN ACETYL RADICAL OR A BENZOYL RADICAL ARE USEFUL NUCLEATING AGENTS IN DIRECT POSITIVE PHOTOGRAPHIC EMULSIONS.
Inventors
- 👤 D Kurtz
- 👤 J Harbison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:28
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/52; C07D263/54; C07D263/56; C07D277/00; C07D277/60; C07D277/62; C07D277/64; C07D293/00; C07D293/10; C07D293/12; G; G03; G03C; G03C1/00; G03C1/005; G03C1/485; G03C1/48538; G03C1/48546
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |