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US2980654A
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Copolymers of n-vinylpyrrolidones with dialkyl maleates or fumarates
Assignee: GAF Chemicals Corp
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Filing: 1957-08-23
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Granted: 1961-04-18
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Expires: 1977-08-23
Abstract
No abstract record available.
Inventors
- 👤 William M Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:22
CPC Classifications
C; C08; C08F; C08F222/00; C08F222/10; C08F222/12; C08F222/14; C08F222/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
A POLYMERIC MATERIAL CHARACTERIZED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
9 words
A POLYMERIC MATERIAL CHARACTERIZED BY THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
GB487593A
Cited
US2335454A
Cited
US2497705A
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US2471959A
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US2594560A
Cited
US2667473A
Cited
US2676949A
Cited
US2827359A
Cited
US2831836A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |