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US2379754A
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Method of washing rotating drum filters
Assignee: Standard Oil Development Co
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Filing: 1940-08-01
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Granted: 1945-07-03
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Expires: 1960-08-01
Abstract
No abstract record available.
Inventors
- 👤 John A Selensky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:32
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/025; B; B01; B01D; B01D33/00; B01D33/06; B01D33/073; B01D33/09; B01D33/44; B01D33/46; B01D33/466; B01D33/48; B01D33/58; B01D33/60; B01D33/62; B01D33/66
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) | 1948-07-02 | 1949-01-01 | 1949-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-07-02 | 1953-01-01 | 1953-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-07-02 | 1957-01-01 | 1957-07-03 | $7700.00 | Window Closed / Lapsed |