US3411273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eliminator type air filter
Assignee: Farr Co
•
Filing: 1964-09-08
•
Granted: 1968-11-19
•
Expires: 1984-09-08
Abstract
No abstract record available.
Inventors
- 👤 Eloise E Duncan
- 👤 Clyde O Boothe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:33
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; B01D46/12; B01D45/00; B01D45/12; B01D45/16; F; F24; F24F; F24F13/00; F24F13/28; F24F8/00; F24F8/10; F24F8/15; F24F8/158
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1521576A
Cited
US1868961A
Cited
US2178614A
Cited
US2130806A
Cited
CH224404A
Cited
US2575499A
Cited
US2764251A
Cited
US2789663A
Cited
US3186149A
Cited
US3243942A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |