US3592731A
Expired / Lapsed
US
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Photographic paper comprising a cationic amino aldehyde resin and a cationic polyamide-epichlorohydrin resin and an anionic polyacrylamide dry strength resin and method for its manufacture
Assignee: Eastman Kodak Co
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Filing: 1968-10-24
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Granted: 1971-07-13
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Expires: 1988-10-24
Abstract
Abstract A PHOTOGRAPHIC PAPER BASE COMPRISING A CATIONIC THERMOSETTING AMINO-ALDEHYDE WET-STRENGTH RESIN, A CATIONIC THERMOSETTING POLYAMIDE - EPICHLOROHYDRIN WET - STRENGTH RESIN, AND AN ANIONIC POLYACRYLAMIDE DRY-STRENGTH RESIN. THIS COMBINATION OF THREE DIFFERENT RESINS GIVE ADEQUATE STRENGTH PROPERTIES WHILE PLROVIDEING AN ALDEHYDE CONCENTRATION WHICH IS GREAT ENOUGH TO PROVIDE THE DESIRED HARDENING OF PHOTOGRAPHIC EMULSION APPLIED TO THE PAPER BASE YET NOT SO GREAT AS TO ADVERSELY AFFECT ITS SENSITOMETRIC PROPERTIES.
Inventors
- 👤 William H Griggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:43
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/55; D21H17/34; D21H17/37; D21H17/375; D21H17/47; D21H17/49; G; G03; G03C; G03C1/00; G03C1/76; G03C1/775
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |