US3290870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disposable air filter for internal combustion engines
Assignee: Walker Manufacturing Co
•
Filing: 1963-11-21
•
Granted: 1966-12-13
•
Expires: 1983-11-21
Abstract
No abstract record available.
Inventors
- 👤 Richard V Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:45
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/024
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |