US3423909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cleaner with improved filter element assembly
Assignee: Novo Industrial Corp
•
Filing: 1967-09-28
•
Granted: 1969-01-28
•
Expires: 1987-09-28
Abstract
No abstract record available.
Inventors
- 👤 Raymond G Bennett
- 👤 Willis H Risse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:20
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/08; B; B01; B01D; B01D46/00; B01D46/10; F02M35/084
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) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |