Patent US2230453A successfully refreshed from Google Patents.
US2230453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic automotive air filter
Assignee: American Air Filter Co Inc
•
Filing: 1938-05-16
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Granted: 1941-02-04
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Expires: 1958-05-16
Abstract
No abstract record available.
Inventors
- 👤 Howard M Fitch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:09
CPC Classifications
B; B01; B01D; B01D45/00; B01D45/12; Y; Y10; Y10S; Y10S55/00; Y10S55/27
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) | 1944-02-04 | 1944-08-05 | 1945-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-02-04 | 1948-08-05 | 1949-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-02-04 | 1952-08-05 | 1953-02-04 | $7700.00 | Window Closed / Lapsed |