US3630868A
Expired / Lapsed
US
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Process for accelerating the radiation induced polymerization of n-vinylpyrrolidone
Assignee: WR Grace and Co
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Filing: 1969-04-23
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Granted: 1971-12-28
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Expires: 1989-04-23
Abstract
Abstract IN ABSTRACT, THIS INVENTION IS DIRECTED TO A PROCESS FOR ACCELERATING THE RATE OF RADIATION INDUCED POLYMERIZATION OF MONOMERIC N-VINYLPYRROLIDONE BY MIXING ABOUT 10-90 PARTS OF THE N-VINYLPYRROLIDONE WITH A SUFFICIENT QUANTITY OF A MONOMERIC ACRYLAMIDE OR ACRYLIC ACID TO MAKE ABOUT 100 PARTS AND IRRADIATING THE THUS FORMED MIXTURE, ALL AS RECITED HEREINAFTER.
Inventors
- 👤 Nelson S Marans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:18
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56; Y; Y10; Y10S; Y10S522/00; Y10S522/911
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |