US2827543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube welding by high frequency resistance heating
Assignee: Magnetic Heating Corp
•
Filing: 1956-07-20
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Granted: 1958-03-18
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Expires: 1976-07-20
Abstract
No abstract record available.
Inventors
- 👤 Wallace C Rudd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:44
CPC Classifications
B; B23; B23K; B23K13/00; B23K13/01; B23K13/02; B23K13/025; B21; B21C; B21C37/00; B21C37/06; B21C37/08; B21C37/0822
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US403157A
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US422730A
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US2020276A
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US2139211A
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US2468796A
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US2599229A
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GB716378A
Cited
FR1095095A
Cited
US2763756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-17 | 1961-09-16 | 1962-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-17 | 1965-09-16 | 1966-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-17 | 1969-09-16 | 1970-03-18 | $7700.00 | Window Closed / Lapsed |