Patent US2537220A successfully refreshed from Google Patents.
US2537220A
Expired / Lapsed
US
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Heat exchanger
Assignee: Power Jets Research and Development Ltd
•
Filing: 1948-06-07
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Granted: 1951-01-09
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Expires: 1968-06-07
Abstract
No abstract record available.
Inventors
- 👤 Hahnemann Horst Wolfhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:14
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/041; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/013; Y10S165/016; Y10S165/027; Y10S165/028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB270759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |