US3137576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing photographic silver halide emulsions utilizing sulfonated polyphenylene oxide
Assignee: Agfa Gevaert NV
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Filing: 1962-10-16
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Granted: 1964-06-16
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Expires: 1982-10-16
Abstract
No abstract record available.
Inventors
- 👤 Himmelmann Wolfgang
- 👤 Mader Helmut
- 👤 Posse Rolf Fred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:19
CPC Classifications
C; C07; C07C; C07C309/00; C08; C08G; C08G65/00; C08G65/34; C08G65/48; C08G65/485; G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; Y; Y10; Y10S; Y10S525/00; Y10S525/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A PROCESS FOR THE PRODUCTION OF PHOTOGRAPHIC SILVER HALIDE EMULSIONS, WHICH COMPRISES COAGULATING A SILVER HALIDE DISPERSION IN AN AQUEOUS GELATINE SOLUTION BY ADDING TO SAID SOLUTION AT A PH VALUE OF ABOUT 7 A WATER SOLUBLE SALT OF A SULFONATED POLYPHENYLENE OXIDE, ADJUSTING THE PH VALUE TO A VALUE OF BETWEEN ABOUT 3.5 AND 6 BY ADDITION OF A WATER SOLUBLE ACID SELECTED FROM THE CLASS CONSISTING OF MINERAL ACIDS AND ORGANIC ACIDS TO CAUSE THE GELATINE TO PERCIPITATE AS A COAGULUM FROM THE SOLUTION, SEPARATING THE COAGULUM FROM THE SUPERNATANT LIQUID, WASHING SAID COAGULUM WITH WATER AND REDISPERSING IT AT A PH VALUE OF AT LEAST 7, SAID SULFONATED POLYPHENYLENE OXIDE HAVING THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
118 words
A PROCESS FOR THE PRODUCTION OF PHOTOGRAPHIC SILVER HALIDE EMULSIONS, WHICH COMPRISES COAGULATING A SILVER HALIDE DISPERSION IN AN AQUEOUS GELATINE SOLUTION BY ADDING TO SAID SOLUTION AT A PH VALUE OF ABOUT 7 A WATER SOLUBLE SALT OF A SULFONATED POLYPHENYLENE OXIDE, ADJUSTING THE PH VALUE TO A VALUE OF BETWEEN ABOUT 3.5 AND 6 BY ADDITION OF A WATER SOLUBLE ACID SELECTED FROM THE CLASS CONSISTING OF MINERAL ACIDS AND ORGANIC ACIDS TO CAUSE THE GELATINE TO PERCIPITATE AS A COAGULUM FROM THE SOLUTION, SEPARATING THE COAGULUM FROM THE SUPERNATANT LIQUID, WASHING SAID COAGULUM WITH WATER AND REDISPERSING IT AT A PH VALUE OF AT LEAST 7, SAID SULFONATED POLYPHENYLENE OXIDE HAVING THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |