US2579211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative heat exchanger
Assignee: Power Jets Research and Development Ltd
•
Filing: 1949-11-25
•
Granted: 1951-12-18
•
Expires: 1969-11-25
Abstract
No abstract record available.
Inventors
- 👤 Raymond K P Stevens
- 👤 Cox Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:34
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/047; F28D19/041; Y; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/013; Y10S165/016; Y10S165/02; Y10S165/021; Y10S165/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1374520A
Cited
US1334393A
Cited
US1332062A
Cited
US1652025A
Cited
GB255418A
Cited
US1859573A
Cited
US2265953A
Cited
US2363110A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |