US3118766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic products and processes
Assignee: Polaroid Corp
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Filing: 1962-05-31
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Granted: 1964-01-21
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Expires: 1982-05-31
Abstract
No abstract record available.
Inventors
- 👤 Peter H Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:45
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
THE METHOD OF PREPARING SILVER HALIDE EMULSIONS WHICH COMPRISES, IN COMBINATION, THE STEPS OF MIXING TOGETHER A WATER-SOLUBLE SILVER SALT AND AT LEAST ONE WATERSOLUBLE HALIDE SALT IN AN AQUEOUS SOLUTION COMPRISING A PEPTIZING AGENT TO FORM THEREIN A DISPERSION OF SIVLER HALIDE, SAID DISPERSION HAVING THEREIN, AT LEAST AFTER FORMATION, AN ACID-COAGULABLE DERIVATIVE OF GELATIN WITH TRIMELLITIC ACID ANHYDRIDE; THE RATIO, BY WEIGHT, OF SAID DERIVATIVE TO SAID PEPTIZING AGENT BEING AT LEAST 1 TO 3; SUBSEQUENTLY LOWERING THE PH TO BRING ABOUT PRECIPITATION AND SEPARARTING THE PRECIPITATED SILVER HADLIDE EMULSION FROM THE SUPERNATANT LIQUID.
Claim 2
Independent Claim
96 words
THE METHOD OF PREPARING SILVER HALIDE EMULSIONS WHICH COMPRISES, IN COMBINATION, THE STEPS OF MIXING TOGETHER A WATER-SOLUBLE SILVER SALT AND AT LEAST ONE WATERSOLUBLE HALIDE SALT IN AN AQUEOUS SOLUTION COMPRISING A PEPTIZING AGENT TO FORM THEREIN A DISPERSION OF SIVLER HALIDE, SAID DISPERSION HAVING THEREIN, AT LEAST AFTER FORMATION, AN ACID-COAGULABLE DERIVATIVE OF GELATIN WITH TRIMELLITIC ACID ANHYDRIDE; THE RATIO, BY WEIGHT, OF SAID DERIVATIVE TO SAID PEPTIZING AGENT BEING AT LEAST 1 TO 3; SUBSEQUENTLY LOWERING THE PH TO BRING ABOUT PRECIPITATION AND SEPARARTING THE PRECIPITATED SILVER HADLIDE EMULSION FROM THE SUPERNATANT LIQUID.
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) | 1967-01-20 | 1967-07-22 | 1968-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-20 | 1971-07-22 | 1972-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-20 | 1975-07-22 | 1976-01-21 | $7700.00 | Window Closed / Lapsed |