US2552937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger and method of making the same
Assignee: Power Jets Research and Development Ltd
•
Filing: 1947-06-10
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Granted: 1951-05-15
•
Expires: 1967-06-10
Abstract
No abstract record available.
Inventors
- 👤 Cohen Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:12
CPC Classifications
F; F28; F28D; F28D17/00; F28D17/02; Y; Y10; Y10S; Y10S264/00; Y10S264/57; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49357
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) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |