US3671256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric hardeners containing aziridinyl units on the side chain
Assignee: Eastman Kodak Co
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Filing: 1970-04-16
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Granted: 1972-06-20
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Expires: 1990-04-16
Abstract
Abstract NEW HIGH MOLECULAR WEIGHT LINEAR ADDITION POLYMERS ARE PROVIDED COMPRISING A MAIN CHAIN OF A LINEAR SATURATED SUBSTITUENT AND A SIDE CHAIN OF AZIRIDINYL UNITS SEPARATED FROM SAID MAIN CHAIN BY A CARBAMYL, CARBONYL OR AN ALKYLENE ESTER GROUP. WHEN INCORPORATED INTO PHOTOGRAPHIC ELEMENTS AND EMULSIONS SAID POLYMERS ARE SUBSTANTIALLY SAFE AND EFFECTIVE HARDENERS FOR HYDROPHILIC COLLOIDS USED THEREIN AS VEHICLES OR BONDERS AND DO NOT EXHIBIT UNWANTED SENSITOMETRIC EFFECTS.
Inventors
- 👤 Louis Morton Minsk
- 👤 Hyman L Cohen
- 👤 Elliott Frauenglass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:35
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/30; G03C1/307; C; C08; C08F; C08F26/00; C08F26/06; G03C1/04; G03C1/053; G03C1/302
Claims Analysis
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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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |