Patent US2492409A successfully refreshed from Google Patents.
US2492409A
Expired / Lapsed
US
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Heat exchanger
Assignee: Lummus Technology LLC
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Filing: 1946-07-31
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Granted: 1949-12-27
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Expires: 1966-07-31
Abstract
No abstract record available.
Inventors
- 👤 George A Worn
- 👤 George W Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:37
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/06; F28F; F28F9/00; F28F9/02; F28F9/0219; F28F2230/00; F28F2280/00; F28F2280/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1810286A
Cited
US1811402A
Cited
US2127129A
Cited
US2226495A
Cited
US2363526A
Cited
GB557926A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |