Patent US2513644A successfully refreshed from Google Patents.
US2513644A
Expired / Lapsed
US
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Heat exchanger
Assignee: Westinghouse Electric Corp
•
Filing: 1945-12-06
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Granted: 1950-07-04
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Expires: 1965-12-06
Abstract
No abstract record available.
Inventors
- 👤 Harold F Hagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:25
CPC Classifications
F; F25; F25D; F25D17/00; F25D17/04; F25D17/06; F25D17/067; Y; Y10; Y10S; Y10S165/00; Y10S165/092; Y10S165/093; Y10S165/096; Y10S165/097; Y10S165/098
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1928331A
Cited
US2252064A
Cited
US2300574A
Cited
US2360386A
Cited
US2366376A
Cited
US2351203A
Cited
US2401918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-03 | 1954-01-02 | 1954-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-03 | 1958-01-02 | 1958-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-03 | 1962-01-02 | 1962-07-04 | $7700.00 | Window Closed / Lapsed |