US3152906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gelatin silver halide compositions and elements containing a water-soluble hydroxyalkyl ether derivative of starch
Assignee: EIDP Inc
•
Filing: 1962-05-07
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Granted: 1964-10-13
•
Expires: 1982-05-07
Abstract
No abstract record available.
Inventors
- 👤 Overman Joseph De Witt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:50
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A PHOTOGRAPHIC COMPOSITION HAVING IMPROVED COVERING POWER OF DEVELOPED SILVER COMPRISING A GELATINOSILVER HALIDE EMULSION CONTAINING FROM ABOUT 20 TO 80 PARTS BY WEIGHT, PER 100 PARTWS BY WEIGHT OF GELATING PRESENT IN SAID EMULSION, OF A WATER-SOLUBLE HYDROXYALKYL ETHER DERIVATIVE OF STARCH HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 10,000 TO 60,000 WHEREIN FROM ABOUT 10 TO 20% OF THE HYDROXYL GROUPS OF SAID STARCH HAVE BEEN ETHERIFIED TO HYDROXY LOWER ALKYL ETHER GROUPS.
Claim 2
Dependent Claim
76 words
A PHOTOGRAPHIC COMPOSITION HAVING IMPROVED COVERING POWER OF DEVELOPED SILVER COMPRISING A GELATINOSILVER HALIDE EMULSION CONTAINING FROM ABOUT 20 TO 80 PARTS BY WEIGHT, PER 100 PARTWS BY WEIGHT OF GELATING PRESENT IN SAID EMULSION, OF A WATER-SOLUBLE HYDROXYALKYL ETHER DERIVATIVE OF STARCH HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 10,000 TO 60,000 WHEREIN FROM ABOUT 10 TO 20% OF THE HYDROXYL GROUPS OF SAID STARCH HAVE BEEN ETHERIFIED TO HYDROXY LOWER ALKYL ETHER GROUPS.
References Cited (Backward Citations)
US3043691A
Cited
US3087918A
Cited
US3063838A
Cited
US3067033A
Cited
US3047392A
Cited
US3043698A
Cited
US3069267A
Cited
US3085009A
Cited
US3085010A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-10-13 | 1968-04-13 | 1968-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-13 | 1972-04-13 | 1972-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-13 | 1976-04-13 | 1976-10-13 | $7700.00 | Window Closed / Lapsed |