Patent US4281549A successfully refreshed from Google Patents.
US2373330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cleaner
Assignee: American Air Filter Co Inc
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Filing: 1942-09-15
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Granted: 1945-04-10
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Expires: 1962-09-15
Abstract
No abstract record available.
Inventors
- 👤 Nutting Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:38
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/02; B01D47/022; B01D47/027; B05; B05B; B05B14/00; B05B14/40; B05B14/46; Y; Y10; Y10S; Y10S29/00; Y10S29/078
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-04-09 | 1948-10-09 | 1949-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-04-09 | 1952-10-09 | 1953-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-04-09 | 1956-10-09 | 1957-04-10 | $7700.00 | Window Closed / Lapsed |