Patent US3381453A successfully refreshed from Google Patents.
US3381453A
Expired / Lapsed
US
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Air-handling device with regenerative filter medium
Assignee: General Electric Co
•
Filing: 1966-06-17
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Granted: 1968-05-07
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Expires: 1986-06-17
Abstract
No abstract record available.
Inventors
- 👤 Raymond L Dills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:51
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/20; F24F; F24F8/00; F24F8/10; F24F8/108; F24F8/15; F24F8/158; F24F8/167
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) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |