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Patent US2938993A successfully refreshed from Google Patents.
US2938993A
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High frequency electrical welding
Assignee: Magnetic Heating Corp
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Filing: 1957-08-29
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Granted: 1960-05-31
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Expires: 1977-08-29
Abstract
No abstract record available.
Inventors
- 👤 Wallace C Rudd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:56
CPC Classifications
B; B23; B23K; B23K13/00; B23K13/01; B23K13/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1189856A
Cited
US2020276A
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US2222579A
Cited
FR972849A
Cited
GB716378A
Cited
FR1095095A
Cited
GB748528A
Cited
US2794108A
Cited
US2818488A
Cited
US2763756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |