US2432290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination flusher and air filter cleaner
Assignee: Stewart Warner Corp
•
Filing: 1942-08-20
•
Granted: 1947-12-09
•
Expires: 1962-08-20
Abstract
No abstract record available.
Inventors
- 👤 Ernest W Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:10
CPC Classifications
B; B60; B60T; B60T17/00; F; F01; F01M; F01M11/00; F01M11/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1666992A
Cited
US1955169A
Cited
US2020350A
Cited
US2174311A
Cited
US2223553A
Cited
US2295539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-08 | 1951-06-09 | 1951-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-08 | 1955-06-09 | 1955-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-08 | 1959-06-09 | 1959-12-09 | $7700.00 | Window Closed / Lapsed |