Patent US2065643A successfully refreshed from Google Patents.
US2065643A
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US
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Method and apparatus for treating clays
Assignee: Doherty Research Co
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Filing: 1934-03-17
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Granted: 1936-12-29
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Expires: 1954-03-17
Abstract
No abstract record available.
Inventors
- 👤 David G Brandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:50
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/30; B01J20/34; B01J20/3483; B01J20/02; B01J20/10; B01J20/12; B01J20/20; B01J20/3416; B01J20/3433; B01J20/345; B01J20/3458; B01J8/00; B01J8/18
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) | 1939-12-29 | 1940-06-29 | 1940-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-12-29 | 1944-06-29 | 1944-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-12-29 | 1948-06-29 | 1948-12-29 | $7700.00 | Window Closed / Lapsed |