Patent US4488946A successfully refreshed from Google Patents.
Patent US2473633A successfully refreshed from Google Patents.
US2473633A
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Method of welding fins to tubular members by electric resistance welding
Assignee: Brown Fintube Co
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Filing: 1946-03-20
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Granted: 1949-06-21
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Expires: 1966-03-20
Abstract
No abstract record available.
Inventors
- 👤 Jr John W Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:16
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/002; B23K11/004; B23K11/0046
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2172667A
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US1019299A
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US2057017A
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US1995368A
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US2261136A
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US2298249A
Cited
US2261137A
Cited
US2298250A
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US2324435A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-20 | 1952-12-20 | 1953-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-20 | 1956-12-20 | 1957-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-20 | 1960-12-20 | 1961-06-21 | $7700.00 | Window Closed / Lapsed |