Patent US2831836A successfully refreshed from Google Patents.
US2831836A
Expired / Lapsed
US
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Copolymers of n-vinylpyrrolidone and diallyl esters of dibasic acids
Assignee: GAF Chemicals Corp
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Filing: 1955-06-16
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Granted: 1958-04-22
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Expires: 1975-06-16
Abstract
No abstract record available.
Inventors
- 👤 Americo L Forchielli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:59
CPC Classifications
C; C08; C08F; C08F18/00; C08F18/02; C08F18/04; C08F18/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
A COMPOSITION OF MATTER COMPRISING A COPOLYMER OF 5 TO 95% OF A DIALLYL ESTER OF A DICARBOXYLIC ACID AND 95 TO 5% OF AN N-VINYLPYRROLIDONE HAVING THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
31 words
A COMPOSITION OF MATTER COMPRISING A COPOLYMER OF 5 TO 95% OF A DIALLYL ESTER OF A DICARBOXYLIC ACID AND 95 TO 5% OF AN N-VINYLPYRROLIDONE HAVING THE FOLLOWING GENERAL FORMULA:
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) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |