US2490959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cleaner
Assignee: Continental Air Filters Inc
•
Filing: 1947-06-05
•
Granted: 1949-12-13
•
Expires: 1967-06-05
Abstract
No abstract record available.
Inventors
- 👤 William K Gregory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:00
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/026
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1875471A
Cited
US1783813A
Cited
US1851427A
Cited
US2062548A
Cited
US2250226A
Cited
US2280417A
Cited
US2309838A
Cited
GB557470A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |