US2081398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operating a continuous filter system
Assignee: Standard Oil Co
•
Filing: 1936-03-14
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Granted: 1937-05-25
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Expires: 1956-03-14
Abstract
No abstract record available.
Inventors
- 👤 Roy N Giles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:21
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; B01D33/463; B01D33/466; B01D33/80; B01D33/804; B01D33/807; B01D35/00; B01D35/16; B01D35/18; 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) | 1940-05-24 | 1940-11-23 | 1941-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-05-24 | 1944-11-23 | 1945-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-05-24 | 1948-11-23 | 1949-05-25 | $7700.00 | Window Closed / Lapsed |