Patent US1808231A successfully refreshed from Google Patents.
US1808231A
Expired / Lapsed
US
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Process of treating clay
Assignee: Individual
•
Filing: 1928-05-11
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Granted: 1931-06-02
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Expires: 1948-05-11
Abstract
No abstract record available.
Inventors
- 👤 William R Jeavons
- 👤 Mahlon J Rentschler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:09
CPC Classifications
C; C04; C04B; C04B2/00; B; B01; B01F; B01F21/00; B01F21/20; B01F21/22; B01F21/30; C04B33/00; C04B33/02; C04B33/04; C04B33/06; C04B33/30; B01F35/00; B01F35/90; B01F2035/99; Y; Y10; Y10S; Y10S264/00; Y10S264/39; Y10T; Y10T137/00; Y10T137/4891; Y10T137/8593; Y10T137/87571; Y10T137/87652; Y10T137/8766
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) | 1934-06-01 | 1934-12-01 | 1935-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-06-01 | 1938-12-01 | 1939-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-06-01 | 1942-12-01 | 1943-06-02 | $7700.00 | Window Closed / Lapsed |