US2627935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cleaner
Assignee: Donaldson Co Inc
•
Filing: 1951-02-07
•
Granted: 1953-02-10
•
Expires: 1971-02-07
Abstract
No abstract record available.
Inventors
- 👤 Beach Silas Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:09
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/026
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE354215C
Cited
GB120304A
Cited
GB120345A
Cited
US2337728A
Cited
US2348452A
Cited
US2391887A
Cited
US2507897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-10 | 1956-08-11 | 1957-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-10 | 1960-08-11 | 1961-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-10 | 1964-08-11 | 1965-02-10 | $7700.00 | Window Closed / Lapsed |