Patent US2995444A successfully refreshed from Google Patents.
US2995444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of photographic emulsions sensitized with alkylene oxide polymers
Assignee: GAF Chemicals Corp
•
Filing: 1957-09-26
•
Granted: 1961-08-08
•
Expires: 1977-09-26
Abstract
No abstract record available.
Inventors
- 👤 Dersch Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:21
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34; G03C1/04; G03C1/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
A PHOTOGRAPHIC ELEMENT COMPRISING A SUPPORT, AT LEAST ONE LIGHT-SENSITIVE SILVER-HALIDE EMULSION LAYER COMPRISING A SILVER-HALIDE DISPERSED IN A COLLOIDAL CARRIER SELECTED FROM THE CLASS CONSISTING OF GELATIN, POLYVINYL ALCOHOL, CASEIN, AND CARBOXY METHYL CELLULOSE, SAID EMULSION LAYER CONTAINING IN INTIMATE CONTACT WITH THE SILVER HALIDE GRAINS THEREOF, A SENSITIZING QUANTITY OF AN ALKYLENE OXIDE POLYMER HAVING A MOLECULAR WEIGHT OF AT LEAST 300 AND BEING SELECTED FROM THE GROUP CONSISTING OF A POLYALKYLENE GLYCOL, A POLYALKYLENE GLYCOL ETHER WHEREIN THE ETHER GROUP IS AN ALIPHATIC CHAIN OF FROM 8 TO 18 CARBON ATOMS AND A POLYALKYLENE GLYCOL ESTER WHEREIN THE ESTER GROUP IS AN ALIPHATIC CHAIN OF FROM 8 TO 18 CARBON ATOMS AND AS AN ANTIFOGGING AGENT FOR SAID EMULSION LAYER AND IN INTIMATE CONTACT WITH THE SILVER HALIDE GRAINS THEREOF 2G. TO 25G. PER MOLE OF SILVER-HALIDE IN THE EMULSION OF POLY-N-VINYL-2-PYRROLIDONE HAVING A K-VALUE OF FROM K-20 TO K-40.
Claim 2
Dependent Claim
153 words
A PHOTOGRAPHIC ELEMENT COMPRISING A SUPPORT, AT LEAST ONE LIGHT-SENSITIVE SILVER-HALIDE EMULSION LAYER COMPRISING A SILVER-HALIDE DISPERSED IN A COLLOIDAL CARRIER SELECTED FROM THE CLASS CONSISTING OF GELATIN, POLYVINYL ALCOHOL, CASEIN, AND CARBOXY METHYL CELLULOSE, SAID EMULSION LAYER CONTAINING IN INTIMATE CONTACT WITH THE SILVER HALIDE GRAINS THEREOF, A SENSITIZING QUANTITY OF AN ALKYLENE OXIDE POLYMER HAVING A MOLECULAR WEIGHT OF AT LEAST 300 AND BEING SELECTED FROM THE GROUP CONSISTING OF A POLYALKYLENE GLYCOL, A POLYALKYLENE GLYCOL ETHER WHEREIN THE ETHER GROUP IS AN ALIPHATIC CHAIN OF FROM 8 TO 18 CARBON ATOMS AND A POLYALKYLENE GLYCOL ESTER WHEREIN THE ESTER GROUP IS AN ALIPHATIC CHAIN OF FROM 8 TO 18 CARBON ATOMS AND AS AN ANTIFOGGING AGENT FOR SAID EMULSION LAYER AND IN INTIMATE CONTACT WITH THE SILVER HALIDE GRAINS THEREOF 2G. TO 25G. PER MOLE OF SILVER-HALIDE IN THE EMULSION OF POLY-N-VINYL-2-PYRROLIDONE HAVING A K-VALUE OF FROM K-20 TO K-40.
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) | 1964-08-07 | 1965-02-06 | 1965-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-07 | 1969-02-06 | 1969-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-07 | 1973-02-06 | 1973-08-08 | $7700.00 | Window Closed / Lapsed |