US3236653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hardening of polyvinyl alcohol maleates
Assignee: Gevaert Photo Producten NV
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Filing: 1961-11-20
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Granted: 1966-02-22
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Expires: 1981-11-20
Abstract
No abstract record available.
Inventors
- 👤 Vrancken Marcel Nicolas
- 👤 Pauw Alfons Jozef De
- 👤 Hart Rene Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:46
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/30; G03C1/307; C; C08; C08F; C08F8/00; C08F8/14; C08K; C08K5/00; C08K5/16; C08K5/17; C08L; C08L101/00; C08L101/02; C08L101/06; C08L101/08; C08L29/00; C08L29/02; C08L29/04; G03C1/04; G03C1/047; G03C1/053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
PROCESS FOR HARDENING A HIGH MOLECULAR WEIGHT MODIFIED POLVINYL ALCOHOL, 4 TO 7% OF THE ALCOHOL GROUPS OF WHICH ARE CONVERTED INTO MONOMALLEATE GROUPS, COMPRISING REACTING SAID MODIFIED POLYVINYL ALCOHOL WITH A GELATIN HAVING AN ISOELECTRIC POINT IN EXCESS 8 AND A GEL STRENGTH OF AT LEAST 220.
Claim 2
Dependent Claim
48 words
PROCESS FOR HARDENING A HIGH MOLECULAR WEIGHT MODIFIED POLVINYL ALCOHOL, 4 TO 7% OF THE ALCOHOL GROUPS OF WHICH ARE CONVERTED INTO MONOMALLEATE GROUPS, COMPRISING REACTING SAID MODIFIED POLYVINYL ALCOHOL WITH A GELATIN HAVING AN ISOELECTRIC POINT IN EXCESS 8 AND A GEL STRENGTH OF AT LEAST 220.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |