Patent US1925659A successfully refreshed from Google Patents.
US3472002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-cleaning drum type filter assembly
Assignee: Air Maze Corp
•
Filing: 1967-02-09
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Granted: 1969-10-14
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Expires: 1987-02-09
Abstract
No abstract record available.
Inventors
- 👤 Richard E Brown
- 👤 Louis S Papp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:14
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/24; B01D46/26
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) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |