US3674497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic emulsions containing nonpolymeric amines
Assignee: 3M Co
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Filing: 1970-10-07
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Granted: 1972-07-04
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Expires: 1990-10-07
Abstract
Abstract IMPROVED, NOVEL PHOTOGRAPHIC EMULSIONS COMPRISING A PHOTOSENSITIVE SILVER HALIDE AND A SYNTHETIC PEPTIZING HYDROPHILIC COLLOID THEREFOR, CONTAINING INCORPORATED THEREIN ABOUT ONE TO 200 MOLE PERCENT BASED ON SILVER PRESENT THEREIN OF THE ACIDIC SALT OF A NONPOLYMERIC AMINE OF THE GROUP CONSISTING OF ALKYLAMINES, AROMATIC AMINES, ALKARYL AMINES, CYCLOALKYL AMINES, AND HETEROCYCLIC AMINES OR MIXTURES THEREOF, SAID AMINES HAVING ONE TO 18 CARBON ATOMS FOR EACH AMINO NITROGEN ATOM CONTAINED THEREIN. ALSO PROVIDED IS A PROCESS FOR MAKING THE NOVEL EMULSIONS. 1,8-MENTHANE DIAMINE, A PREFERRED NONPOLYMERIC AMINE, ALSO FORMS A USEFUL COMPLEX WITH SILVER HALIDE.
Inventors
- 👤 Ramsis Gobran
- 👤 Ronald F Ofstead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:54
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/06; G03C1/08; G03C1/10
Claims Analysis
Total Claims: 0
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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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |