US3397514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter
Assignee: Individual
•
Filing: 1966-09-13
•
Granted: 1968-08-20
•
Expires: 1986-09-13
Abstract
No abstract record available.
Inventors
- 👤 Rothfeld Otto
- 👤 Verbena Benno Dasch La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:19
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/024
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE316594C
Cited
GB190021243A
Cited
US942503A
Cited
US1069335A
Cited
US1855722A
Cited
US1670660A
Cited
US2190886A
Cited
FR867820A
Cited
FR880018A
Cited
US3220167A
Cited
US3115459A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |