Patent US3020027A successfully refreshed from Google Patents.
US3020027A
Expired / Lapsed
US
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Heat exchanger tubes with radially extending fins transversely connected thereto and method of forming the same
Assignee: Babcock International Ltd
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Filing: 1958-11-12
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Granted: 1962-02-06
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Expires: 1978-11-12
Abstract
No abstract record available.
Inventors
- 👤 Owen W Dumpleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:47
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1382220A
Cited
US1764603A
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US1689568A
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US2003320A
Cited
US2261136A
Cited
US2482951A
Cited
US2473633A
Cited
US2965744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |