Patent US3178397A successfully refreshed from Google Patents.
US3178397A
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Water-soluble acrylic copolymers containing quaternary ammonium groups and including n-vinyl pyrrolidone type comonomer
Assignee: BASF Schweiz AG
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Filing: 1962-09-24
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Granted: 1965-04-13
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Expires: 1982-09-24
Abstract
No abstract record available.
Inventors
- 👤 Olaj Oskar
- 👤 Maeder Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:38
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/22; C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/60; C08F220/00; C08F220/02; C08F220/04; C08F220/06; C08F26/00; C08F26/06; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S260/17; Y10S260/18; Y10S526/00; Y10S526/923
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
53 words
A WATER-SOLUBLE COPOLYMER CONTAINING QUATERNARY AMMONIUM GROUPS WHICH COPOLYMER CONSISTS ESSENTIALLY OF LINEAR ADDITIVELY COMBINED UNTIS OF (1) 10 TO 75 MOL PERCENT OF N-VINYL-PYRROLIDONE, (2) 10 TO 45 MOL PERCENT OF QUATERNATED N:N-DIETHYLAMINOPROPYL ACRYLAMIDE, (3) 10 TO 45 MOL PERCENT OF SODIUM ACRYLATE, AND (4) UP TO 60 MOL PERCENT OF ACRYLAMIDE.
References Cited (Backward Citations)
US2818362A
Cited
US3008851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |