US2670083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of filtrate from filter cakes
Assignee: Phillips Petroleum Co
•
Filing: 1949-10-28
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Granted: 1954-02-23
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Expires: 1969-10-28
Abstract
No abstract record available.
Inventors
- 👤 Dwight L Mckay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:59
CPC Classifications
B; B01; B01D; B01D37/00; B01D33/00; B01D33/06; B01D33/073; B01D33/09; B01D33/44; B01D33/46; B01D33/463; B01D33/466; C; C07; C07C; C07C7/00; C07C7/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1770052A
Cited
US2168140A
Cited
US2245952A
Cited
US2301595A
Cited
US2398526A
Cited
US2435792A
Cited
US2429430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |