US3694252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming capsules of polymer coated silver halide grains
Assignee: Polaroid Corp
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Filing: 1971-05-19
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Granted: 1972-09-26
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Expires: 1991-05-19
Abstract
Abstract THIS APPLICATION IS DIRECTED TO A METHOD FOR PREPARING MICROCAPSULES COMPRISING A NUCLEUS OF SILVER HALIDE SURROUNDED BY A CONTINUOUS WALL OF A SYNTHETIC POLYMER, WHICH METHOD COMPRISES SUBJECTING THE REACTANTS INCLUDING MONOMER AND SILVER HALIDE GRAINS IN AN ELECTROLYTE TO AN ELECTRIC FIELD BETWEEN A PAIR OF ELECTRODES, WHEREBY, THE MONOMERS PREFERRENTIALLY POLYMERIZE AROUND THE SILVER HALIDE.
Inventors
- 👤 Arthur M Gerber
- 👤 Sybil N Story
- 👤 Vivian K Walworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:45
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/002; B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/18; B01J13/185; C; C08; C08F; C08F2/00; C08F2/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |