Patent US3151998A successfully refreshed from Google Patents.
US3151998A
Expired / Lapsed
US
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Method for improving physical properties of clays and clay-containing materials and compositions resulting therefrom
Assignee: Dow Chemical Co
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Filing: 1961-05-03
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Granted: 1964-10-06
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Expires: 1981-05-03
Abstract
No abstract record available.
Inventors
- 👤 John B Hemwall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:30
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1305; C09; C09K; C09K17/00; C09K17/14; Y; Y10; Y10S; Y10S106/00; Y10S106/90
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
40 words
A COMPOSITION OF A CLAY MATERIAL OF THE GROUP CONSISTING OF CLAYS AND CLAY-CONTAINING SOILS HAVING AT LEAST 5 WEIGHT PERCENT CLAY CONTAINING IN AMIXTURE THEREWITH AT LEAST 0.0025 WEIGHT PERCENT, DRY CLAY BASIS, OF A COMPOUND HAVING THE FORMULA:
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) | 1967-10-06 | 1968-04-06 | 1968-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-06 | 1972-04-06 | 1972-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-06 | 1976-04-06 | 1976-10-06 | $7700.00 | Window Closed / Lapsed |