Patent US3152906A successfully refreshed from Google Patents.
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
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Filing: 1962-05-07
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Granted: 1964-10-13
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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
2026-10-29 13:53
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.
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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 |