US2826672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of welding fins to tubes
Assignee: Brown Fintube Co
•
Filing: 1955-02-16
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Granted: 1958-03-11
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Expires: 1975-02-16
Abstract
No abstract record available.
Inventors
- 👤 Jr John W Brown
- 👤 Arvid C K Nihlen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:30
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/08; B23; B23K; B23K11/00; B23K11/002; B23K11/004; B23K11/0046; 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)
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US2321308A
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US2550965A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-10 | 1961-09-09 | 1962-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-10 | 1965-09-09 | 1966-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-10 | 1969-09-09 | 1970-03-11 | $7700.00 | Window Closed / Lapsed |