US3138461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing silver halide emulsions containing gelatin derivatives
Assignee: Polaroid Corp
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Filing: 1960-06-10
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Granted: 1964-06-23
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Expires: 1980-06-10
Abstract
No abstract record available.
Inventors
- 👤 William H Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:51
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
IN A METHOD OF PREPARING SILVER HALIDE DISPERSIONS, THE STEPS WHICH COMPRISE MIXING TOGETHER A WATER-SOLUBLE SILVER SALT AND AT LEAST ONE WATER-SOLUBLEALKALI METAL HALIDE SALT IN AN AQUEOUS SOLUTION OF GELATIN, THEREBY FORMING A SILVER HALIDE DISPERSION, REACTING THE GELATIN WITH A HETEROCYCLIC COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
48 words
IN A METHOD OF PREPARING SILVER HALIDE DISPERSIONS, THE STEPS WHICH COMPRISE MIXING TOGETHER A WATER-SOLUBLE SILVER SALT AND AT LEAST ONE WATER-SOLUBLEALKALI METAL HALIDE SALT IN AN AQUEOUS SOLUTION OF GELATIN, THEREBY FORMING A SILVER HALIDE DISPERSION, REACTING THE GELATIN WITH A HETEROCYCLIC 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) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |