US2946573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary regenerative heat exchangers
Assignee: Svenska Rotor Maskiner AB
•
Filing: 1956-06-18
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Granted: 1960-07-26
•
Expires: 1976-06-18
Abstract
No abstract record available.
Inventors
- 👤 Lindhagen Teodor Immanuel
- 👤 Odman Tor Axel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:33
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/041; F28D19/042; F28D19/044
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US902812A
Cited
US2023965A
Cited
US2157744A
Cited
US2374608A
Cited
US2438851A
Cited
US2596642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-26 | 1964-01-25 | 1964-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-26 | 1968-01-25 | 1968-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-26 | 1972-01-25 | 1972-07-26 | $7700.00 | Window Closed / Lapsed |