US3068905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extended surface fins for heat exchange tubes
Assignee: Westinghouse Electric Corp
•
Filing: 1960-03-28
•
Granted: 1962-12-18
•
Expires: 1980-03-28
Abstract
No abstract record available.
Inventors
- 👤 John H T Millington
- 👤 Fein Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:51
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/26; F28F1/28; F28F1/42; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/49384
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1689446A
Cited
US1705572A
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US1880533A
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US2153806A
Cited
US2196707A
Cited
US2291985A
Cited
US2646972A
Cited
US2717320A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-17 | 1966-06-18 | 1966-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-17 | 1970-06-18 | 1970-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-17 | 1974-06-18 | 1974-12-18 | $7700.00 | Window Closed / Lapsed |