Patent US3306750A successfully refreshed from Google Patents.
US3306750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric hardeners for gelatin
Assignee: Eastman Kodak Co
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Filing: 1966-01-17
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Granted: 1967-02-28
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Expires: 1986-01-17
Abstract
No abstract record available.
Inventors
- 👤 Louis M Minsk
- 👤 Hyman L Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:43
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/30; G03C1/307; C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
74 words
A COMPOSITION OF MATTER COMPRISING GELATIN CONTAINING AN EFFECTIVE AMOUNT OF A HARDENER COMPRISING A COMPOUND COMPOSED OF A POLYMERIC LINEAR CHAIN HAVING APPENDED THERETO AT LEAST 3% OF CARBOXYL IN AMOUNT TO INSURE WATER SOLUBILITY AND COMPATIBILITY WITH GELATIN AND AT LEAST 2% OF GHO CONNECTED TO SAID CHAIN BY A HETERO LINKAGE CONSISTING OF AT LEAST 2 ATOMS AT LEAST ONE OF WHICH IS CARBON AND THE OTHER IS NITROGEN OR OXYGEN.
Claim 2
Dependent Claim
74 words
A COMPOSITION OF MATTER COMPRISING GELATIN CONTAINING AN EFFECTIVE AMOUNT OF A HARDENER COMPRISING A COMPOUND COMPOSED OF A POLYMERIC LINEAR CHAIN HAVING APPENDED THERETO AT LEAST 3% OF CARBOXYL IN AMOUNT TO INSURE WATER SOLUBILITY AND COMPATIBILITY WITH GELATIN AND AT LEAST 2% OF GHO CONNECTED TO SAID CHAIN BY A HETERO LINKAGE CONSISTING OF AT LEAST 2 ATOMS AT LEAST ONE OF WHICH IS CARBON AND THE OTHER IS NITROGEN OR OXYGEN.
Claim 3
Dependent Claim
13 words
THE COMPOSITION OF CLAIM 1 IN WHICH THE HARDENER IS COPOLY(ETHYLENE-(4-FORMYLBUTYL) ACID MALEATE).
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) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |