US3372533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-supporting high density filter
Assignee: Farr Co
•
Filing: 1966-07-11
•
Granted: 1968-03-12
•
Expires: 1986-07-11
Abstract
No abstract record available.
Inventors
- 👤 Raymond W Rummel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:13
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/28; B; B01; B01D; B01D46/00; B01D46/0001; B01D46/0084; B01D46/0097; B01D46/10; B01D46/52; B01D46/521; B01D46/525; B01D2275/00; B01D2275/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1049789A
Cited
US1883715A
Cited
GB540215A
Cited
US3099547A
Cited
FR1275496A
Cited
FR1281293A
Cited
FR1288229A
Cited
US3190058A
Cited
US3173777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-12 | 1971-09-11 | 1972-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-12 | 1975-09-11 | 1976-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-12 | 1979-09-11 | 1980-03-12 | $7700.00 | Window Closed / Lapsed |