Patent US2997465A successfully refreshed from Google Patents.
US2997465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of water-soluble copolymers
Assignee: BASF SE
•
Filing: 1957-07-02
•
Granted: 1961-08-22
•
Expires: 1977-07-02
Abstract
No abstract record available.
Inventors
- 👤 Krause Hans-Joachim
- 👤 Drexler Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:48
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/04; C08F220/06; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A WATER-SOLUBLE COPOLYMER OF MONOMERS CONSISTING ESSENTIALLY OF FROM 50 TO 90% OF ACRYLIC ACID, 2 TO 25% OF ACRYLONITRILE, 2 TO 15% OF AN ACRYLIC ACID ESTER OF A 1 TO 4 CARBON ATOM ALKANOL AND 0 TO 30% OF AT LEAST ONE AMIDE SELECTED FROM THE GROUP CONSISTING OF ACRYLAMIDE AND METHACRYLAMIDE.
Claim 2
Dependent Claim
54 words
A WATER-SOLUBLE COPOLYMER OF MONOMERS CONSISTING ESSENTIALLY OF FROM 50 TO 90% OF ACRYLIC ACID, 2 TO 25% OF ACRYLONITRILE, 2 TO 15% OF AN ACRYLIC ACID ESTER OF A 1 TO 4 CARBON ATOM ALKANOL AND 0 TO 30% OF AT LEAST ONE AMIDE SELECTED FROM THE GROUP CONSISTING OF ACRYLAMIDE AND METHACRYLAMIDE.
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) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |