US2534707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of photographic emulsions
Assignee: EIDP Inc
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Filing: 1946-11-27
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Granted: 1950-12-19
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Expires: 1966-11-27
Abstract
No abstract record available.
Inventors
- 👤 Charles F Glick
- 👤 Postell M Nicholes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:31
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
THE PROCESS WHICH COMPRISES TREATING AN AQUEOUS SOLUTION OF A WATER-SOLUBLE TO HYDROPHILIC SYNTHETIC HYDROXYL POLYMER SILVER HALIDE EMULSION, SAID POLYMER CONTAINING A PLURALITY OF RECURRING INTRALINEAR -CH2-CHOH GROUPS, WITH A MIXTURE OF BORIC ACID ESTER OF DIETHYLENE GLYCOL AND SODIUM SULFATE, SAID ESTER AND SODIUM SULFATE BEING PRESENT IN INSUFFICIENT QUANTITY ALONE BUT IN SUFFICIENT QUANTITY TOGETHER TO EFFECT A MATERIAL GELLING OF THE HYDROXYL POLYMER, ADJUSTING THE PH OF THE SOLUTION TO MORE THAN 7, EXTRUDING THE RESULTING GEL INTO AN ACETONE BATH AND WASHING THE RESULTING SHREDS WITH WATER.
Claim 2
Dependent Claim
92 words
THE PROCESS WHICH COMPRISES TREATING AN AQUEOUS SOLUTION OF A WATER-SOLUBLE TO HYDROPHILIC SYNTHETIC HYDROXYL POLYMER SILVER HALIDE EMULSION, SAID POLYMER CONTAINING A PLURALITY OF RECURRING INTRALINEAR -CH2-CHOH GROUPS, WITH A MIXTURE OF BORIC ACID ESTER OF DIETHYLENE GLYCOL AND SODIUM SULFATE, SAID ESTER AND SODIUM SULFATE BEING PRESENT IN INSUFFICIENT QUANTITY ALONE BUT IN SUFFICIENT QUANTITY TOGETHER TO EFFECT A MATERIAL GELLING OF THE HYDROXYL POLYMER, ADJUSTING THE PH OF THE SOLUTION TO MORE THAN 7, EXTRUDING THE RESULTING GEL INTO AN ACETONE BATH AND WASHING THE RESULTING SHREDS WITH WATER.
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) | 1953-12-18 | 1954-06-19 | 1954-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-18 | 1958-06-19 | 1958-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-18 | 1962-06-19 | 1962-12-19 | $7700.00 | Window Closed / Lapsed |