Patent US3687846A successfully refreshed from Google Patents.
US3687846A
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High yield bentonites
Assignee: Amcol International Corp
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Filing: 1970-06-02
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Granted: 1972-08-29
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Expires: 1990-06-02
Abstract
Abstract THE PROPERTIES OF BENTONITE ARE ENHANCED FOR USE IN AQUEOUS SUSPENSIONS BY INTIMATELY MIXING WITH THE CLAY MINOR AMOUNTS OF A WATER-SOLUBLE POLYMER CONTAINING CARBOXYL GROUPS OR SALT THEREOF (E.G., A WATER-SOLUBLE POLYACRYLIC ACID OR SALT THEREOF) OR A POLYMER ON WHICH CARBOXYL GROUPS ARE FORMED IN WATER, AND A WATER-SOLUBLE POLYALKYLENE OXIDE.
Inventors
- 👤 William J Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:14
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1305; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24; Y; Y10; Y10S; Y10S507/00; Y10S507/901
Claims Analysis
Total Claims: 0
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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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |