US2679090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making filters
Assignee: Farr Co
•
Filing: 1949-08-30
•
Granted: 1954-05-25
•
Expires: 1969-08-30
Abstract
No abstract record available.
Inventors
- 👤 Richard S Farr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:35
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/10; B01D39/12; B01D46/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/496; Y10T29/49604; Y10T29/49826; Y10T29/49833; Y10T29/49838; Y10T29/49945
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |