US1874972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for continuous filtration
Assignee: Texaco Inc
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Filing: 1929-11-04
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Granted: 1932-08-30
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Expires: 1949-11-04
Abstract
No abstract record available.
Inventors
- 👤 Frank W Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:47
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/025; B; B01; B01D; B01D33/00; B01D33/15; B01D33/21; B01D33/44; B01D33/46; B01D33/463; B01D33/48; B01D33/50; B01D33/58; B01D33/62; B01D33/66; B01D37/00
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) | 1935-08-30 | 1936-02-29 | 1936-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-08-30 | 1940-02-29 | 1940-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-08-30 | 1944-02-29 | 1944-08-30 | $7700.00 | Window Closed / Lapsed |