Patent US2657020A successfully refreshed from Google Patents.
US2657020A
Expired / Lapsed
US
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Heat exchanger
Assignee: ITT Bell and Gossett Inc
•
Filing: 1949-09-20
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Granted: 1953-10-27
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Expires: 1969-09-20
Abstract
No abstract record available.
Inventors
- 👤 Maurice H Hofmeister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:50
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/48; F24H1/52; Y; Y10; Y10S; Y10S165/00; Y10S165/454; Y10S165/495
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US725737A
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US1382670A
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US1818762A
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US1905470A
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US1901090A
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US1936284A
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US2154178A
Cited
US2049153A
Cited
GB591602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |