Patent US3006900A successfully refreshed from Google Patents.
US3006900A
Expired / Lapsed
US
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Production of water-soluble copolymers of methacrylamide and n-vinylpyrrolidone
Assignee: BASF SE
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Filing: 1958-05-13
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Granted: 1961-10-31
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Expires: 1978-05-13
Abstract
No abstract record available.
Inventors
- 👤 Fikentscher Hans
- 👤 Wilhelm Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:44
CPC Classifications
C; C08; C08F; C08F226/00; C08F226/06; C08F226/10; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A PROCESS FOR THE PRODUCTION FO A HIGH-MOLECULAR WEIGHT WATER-SOLUBLE COPOLYMER WHICH COMPRISES COPOLYMERIZING (A) METHACRYLAMIDE AND (B) FROM AT LEAST 10% UP TO ABOUT 90% BY WEIGHT OF N-VINYLPRROLIDONE, WITH REFERENCE TO TOTAL WEIGHT OF MONOMERS IN AQUEOUS SOLUTION AT A TEMPERATURE BETWEEN 20*C. AND 150*C. AND IN THE PRESENCE OF AN AZO-BISNITRILE CATALYST, WHEREBY THE RESULTING COPOLYMER HAS A K-VALUE OF AT LEAST ABOUT 35.5.
Claim 2
Dependent Claim
67 words
A PROCESS FOR THE PRODUCTION FO A HIGH-MOLECULAR WEIGHT WATER-SOLUBLE COPOLYMER WHICH COMPRISES COPOLYMERIZING (A) METHACRYLAMIDE AND (B) FROM AT LEAST 10% UP TO ABOUT 90% BY WEIGHT OF N-VINYLPRROLIDONE, WITH REFERENCE TO TOTAL WEIGHT OF MONOMERS IN AQUEOUS SOLUTION AT A TEMPERATURE BETWEEN 20*C. AND 150*C. AND IN THE PRESENCE OF AN AZO-BISNITRILE CATALYST, WHEREBY THE RESULTING COPOLYMER HAS A K-VALUE OF AT LEAST ABOUT 35.5.
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) | 1964-10-30 | 1965-05-01 | 1965-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-30 | 1969-05-01 | 1969-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-30 | 1973-05-01 | 1973-10-31 | $7700.00 | Window Closed / Lapsed |