US2646620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of joining together the ends of thin-walled aluminum heat exchange tubes
Assignee: United Aircraft Products Inc
•
Filing: 1947-04-14
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Granted: 1953-07-28
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Expires: 1967-04-14
Abstract
No abstract record available.
Inventors
- 👤 Walter H Geddes
- 👤 Gunnar G Karlson
- 👤 Werensky Matthew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:49
CPC Classifications
B; B23; B23K; B23K3/00; B23K3/06; B23K3/0646; B23K3/0669; B23K2101/00; B23K2101/04; B23K2101/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49393
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US572200A
Cited
US1326971A
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US1342703A
Cited
US2443577A
Cited
US2443574A
Cited
US2417662A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |