US3369349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust separating device
Assignee: Farr Co
•
Filing: 1964-02-28
•
Granted: 1968-02-20
•
Expires: 1984-02-28
Abstract
No abstract record available.
Inventors
- 👤 Richard S Farr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:26
CPC Classifications
B; B01; B01D; B01D45/00; B01D45/04; B01D45/08; B01D45/12; B01D45/16; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/496; Y10T29/49604; Y10T29/49826; Y10T29/49895
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US366169A
Cited
FR748209A
Cited
US2087789A
Cited
US2357734A
Cited
GB662072A
Cited
US3155474A
Cited
US3237386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-19 | 1971-08-21 | 1972-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-19 | 1975-08-21 | 1976-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-19 | 1979-08-21 | 1980-02-20 | $7700.00 | Window Closed / Lapsed |