US2664274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus employing sonic waves in heat exchange
Assignee: Lummus Technology LLC
•
Filing: 1951-12-22
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Granted: 1953-12-29
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Expires: 1971-12-22
Abstract
No abstract record available.
Inventors
- 👤 George A Worn
- 👤 Frank L Rubin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:52
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/16; F28D7/06; F28F; F28F13/00; F28F13/06; F28F13/10; F28F9/00; F28F9/005; Y; Y10; Y10S; Y10S165/00; Y10S165/318
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1570781A
Cited
US1834875A
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US1982341A
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GB532144A
Cited
US2351163A
Cited
US2514797A
Cited
US2523174A
Cited
US2489944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |