Patent US2732027A successfully refreshed from Google Patents.
US2732027A
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Ventilating apparatus with heat
Assignee: Svenska Flaktfabriken AB
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Filing: 1951-12-07
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Granted: 1956-01-24
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Expires: 1971-12-07
Abstract
No abstract record available.
Inventors
- 👤 Sven Werner Wallin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:46
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/12; F24F3/14; F24F3/1411; F16; F16K; F16K13/00; F16K13/02; F24F12/00; F24F12/001; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F28; F28D; F28D17/00; F28D17/04; F24F2003/1458; Y; Y02; Y02B; Y02B30/00; Y02B30/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1206977A
Cited
US1924849A
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US2204431A
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US2248225A
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US2257478A
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US2501280A
Cited
US2606627A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-23 | 1959-07-25 | 1960-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-23 | 1963-07-25 | 1964-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-23 | 1967-07-25 | 1968-01-24 | $7700.00 | Window Closed / Lapsed |