Patent US3402654A successfully refreshed from Google Patents.
US3402654A
Expired / Lapsed
US
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Ventilation control
Assignee: American Air Filter Co Inc
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Filing: 1966-05-04
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Granted: 1968-09-24
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Expires: 1986-05-04
Abstract
No abstract record available.
Inventors
- 👤 Albert H Berst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:25
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/04; F24F7/06; F24F7/08; F24F11/00; F24F11/70; F24F11/72; F24F11/74; F24F11/76; F24F11/30; F24F2110/00; F24F2110/10; F24F2110/40; F24F2221/00; F24F2221/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |