Patent US3368334A successfully refreshed from Google Patents.
US3368334A
Expired / Lapsed
US
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Air filter and air pressure regulating unit
Assignee: TRYCO Manufacturing CO Inc
•
Filing: 1964-05-18
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Granted: 1968-02-13
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Expires: 1984-05-18
Abstract
No abstract record available.
Inventors
- 👤 Robert B West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:04
CPC Classifications
A; A01; A01C; A01C23/00; A01C23/04; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/85978; Y10T137/86171
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) | 1971-02-12 | 1971-08-14 | 1972-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-12 | 1975-08-14 | 1976-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-12 | 1979-08-14 | 1980-02-13 | $7700.00 | Window Closed / Lapsed |