Patent US3389649A successfully refreshed from Google Patents.
US3389649A
Expired / Lapsed
US
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Valve for supplied or exhausted room air
Assignee: Svenska Flaktfabriken AB
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Filing: 1966-11-25
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Granted: 1968-06-25
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Expires: 1986-11-25
Abstract
No abstract record available.
Inventors
- 👤 Larkfeldt Birger
- 👤 Svensson Anders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:56
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/072; F24F11/00; F24F11/70; F24F11/72; F24F11/74; F24F13/062; F24F13/08; F24F13/10; F24F13/14; F24F13/1413
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) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |