US3583911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylic acid-methyl cellulose graft copolymers for treating sub-bentonitic clay
Assignee: International Minerals and Chemical Corp
•
Filing: 1968-09-04
•
Granted: 1971-06-08
•
Expires: 1988-09-04
Abstract
Abstract WATER-SOLUBLE GRAFT COPOLYMERS OF ACRYLIC ACID WITH METHYL CELLULOSE CONTAINING UP TO 10% BY WEIGHT, BASED ON THE WEIGHT OF ACRYLIC ACID, OF METHYL CELLULOSE, AND WATER-SOLUBLE SALTS THEREOF, ARE USEFULFOR TREATING SUBBENTONITRIC CLAYS, SUCH AS TO RENDER THEM ESPECIALLY USEFUL IN WELL DRILLING.
Inventors
- 👤 William J Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:06
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1305; B; B22; B22C; B22C1/00; B22C1/16; B22C1/167; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |