US2874940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Svenska Rotor Maskiner AB
•
Filing: 1951-05-16
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Granted: 1959-02-24
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Expires: 1971-05-16
Abstract
No abstract record available.
Inventors
- 👤 Ahlen Karl Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:41
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F22; F22D; F22D1/00; F22D1/006; F23; F23L; F23L15/00; F23L15/02; F28D11/00; F28D11/02; Y; Y02; Y02E; Y02E20/00; Y02E20/34; Y10; Y10S; Y10S165/00; Y10S165/135; Y10S165/139; Y10S165/156; Y10S165/159
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE545782C
Cited
GB252373A
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US1639051A
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US1698313A
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US1897613A
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US1914084A
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GB500389A
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US2402307A
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US2369993A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |