Patent US6167250A successfully refreshed from Google Patents.
Patent US2658728A successfully refreshed from Google Patents.
US2658728A
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Method of detecting leakage between heat transfer fluids
Assignee: Lummus Technology LLC
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Filing: 1948-06-25
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Granted: 1953-11-10
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Expires: 1968-06-25
Abstract
No abstract record available.
Inventors
- 👤 Jr George W Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:17
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/16; F28D7/1607; F28F; F28F1/00; F28F1/003; Y; Y10; Y10S; Y10S55/00; Y10S55/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US164757A
Cited
US1848939A
Cited
GB273605A
Cited
US1994762A
Cited
US1920567A
Cited
US1856618A
Cited
US1921988A
Cited
US2379106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |