US3690888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making silver halide emulsions having polyvalent metal ions occluded therein
Assignee: Eastman Kodak Co
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Filing: 1970-06-04
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Granted: 1972-09-12
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Expires: 1990-06-04
Abstract
Abstract AN IMPROVED PROCESS IS DISCLOSED FOR PREPARING SILVER HALIDE EMULSIONS WHICH CONTAIN GRAINS HAVING POLYVALENT METAL IONS OCCLUDED THEREIN; THE IMPROVEMENT COMPRISES THE STEP OF FORMING THE SILVER HALIDE GRAINS IN THE PRESENCE OF (1) A PEPTIZER CONSISTING ESSENTIALLY OF AN ACRYLIC POLYMER AND (2) THE POLYVALENT METAL IONS TO BE OCCLUDED INSIDE THE GRAINS.
Inventors
- 👤 Robert Elwin Bacon
- 👤 Ernest John Perry
- 👤 Evan Thomas Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:26
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/04; G03C1/053; G03C1/485; G03C1/48515; G03C1/48523
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |