US2785806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil filter
Assignee: Air Maze Corp
•
Filing: 1953-04-27
•
Granted: 1957-03-19
•
Expires: 1973-04-27
Abstract
No abstract record available.
Inventors
- 👤 Richard E Brown
- 👤 Henry W Matlock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:33
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/50; B01D29/52; B01D29/39; B01D29/41
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1619118A
Cited
US1503421A
Cited
GB227550A
Cited
US2320725A
Cited
US2423547A
Cited
US2533192A
Cited
US2538575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-18 | 1960-09-17 | 1961-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-18 | 1964-09-17 | 1965-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-18 | 1968-09-17 | 1969-03-19 | $7700.00 | Window Closed / Lapsed |