Patent US4728589A successfully refreshed from Google Patents.
US3132945A
Expired / Lapsed
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Silver halide emulsions containing vinyl sulfone-gelatin derivatives
Assignee: Polaroid Corp
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Filing: 1960-07-13
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Granted: 1964-05-12
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Expires: 1980-07-13
Abstract
No abstract record available.
Inventors
- 👤 William H Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:45
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/047
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
50 words
IN A METHOD OF PREPARING WASHED SILVER HALIDE, DISPERSIONS, THE STEPS WHICH COMPRISE MIXING TOGETHER A WATER-SOLUBLE SILVER SALT AND AT LEAST ONE WATER-SOLUBLE ALKALI METAL HALIDE SALT IN AN AQUEOUS SOLUTION OF GELATIN, THEREBY FORMING A SILVER HALIDE DISPERSION, REACTING THE GELATIN WITH AN ORGANIC COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
50 words
IN A METHOD OF PREPARING WASHED SILVER HALIDE, DISPERSIONS, THE STEPS WHICH COMPRISE MIXING TOGETHER A WATER-SOLUBLE SILVER SALT AND AT LEAST ONE WATER-SOLUBLE ALKALI METAL HALIDE SALT IN AN AQUEOUS SOLUTION OF GELATIN, THEREBY FORMING A SILVER HALIDE DISPERSION, REACTING THE GELATIN WITH AN ORGANIC COMPOUND OF THE FORMULA:
Claim 3
Dependent Claim
24 words
A PHOTOSENSITIVE SILVER HALIDE GELATIN EMULSION COMPRISING, IN COMBINATION, SILVER HALIDE AND THE REACTION PRODUCT OF GELATIN AND AN ORGANIC COMPOUND OF THE FORMULA:
Claim 4
Dependent Claim
24 words
A PHOTOSENSITIVE SILVER HALIDE GELATIN EMULSION COMPRISING, IN COMBINATION, SILVER HALIDE AND THE REACTION PRODUCT OF GELATIN AND AN ORGANIC COMPOUND OF THE FORMULA:
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) | 1967-05-12 | 1967-11-11 | 1968-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-12 | 1971-11-11 | 1972-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-12 | 1975-11-11 | 1976-05-12 | $7700.00 | Window Closed / Lapsed |