US3671190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic clay-like minerals of the smectite type and method of preparation
Assignee: Evonik LIL Ltd
•
Filing: 1970-11-10
•
Granted: 1972-06-20
•
Expires: 1990-11-10
Abstract
Abstract SYNTHETIC CLAY-LIKE MINERAL OF THE SMECRITE TYPE HAVING THE GENERAL STRUCTURAL FORMULA (SI8MG8LI2H1+CO24)(12-B-C)-M(12-2A-B-C)+ AND HAVING (I) M AS A SODIUM, A LITHIUM OR AN EQUIVALENT OF AN ORGANIC CATION (II) THE VALUE OF A,B AND C SUCH THAT EITHER A<6; B>O;C>8 AND B+C<2;+(A+B+C-6)<2 OR A<6;B=O;$C<2 AND $(A+C-6)<2 (III) A CATION EXCHANGE CAPACITY OF ABOUT 50 TO 120 MEQ./100G. (IV) WHEN M IS NA+ OR LI+, A BINGHAM YIELD VALUE OF AT LEAST 40 OR 50 DYNES/CM.2 AS A 2% DISPERSION IN TAPWATER.
Inventors
- 👤 Barbara Susan Neumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:26
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/36; C01B33/38; C01B33/44; C01B33/40; C01B33/405
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |