US2665811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Percolation filter
Assignee: ExxonMobil Oil Corp
•
Filing: 1950-09-23
•
Granted: 1954-01-12
•
Expires: 1970-09-23
Abstract
No abstract record available.
Inventors
- 👤 Robert E Turkleson
- 👤 Billy J Showalter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:46
CPC Classifications
C; C10; C10M; C10M175/00; C10M175/0058; C10M175/0008; C10M2201/00; C10M2201/10; C10M2201/102; C10M2201/103
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |