US2857503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seam welding by high frequency resistance heating
Assignee: Magnetic Heating Corp
•
Filing: 1957-02-06
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Granted: 1958-10-21
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Expires: 1977-02-06
Abstract
No abstract record available.
Inventors
- 👤 Wallace C Rudd
- 👤 Robert J Stanton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:35
CPC Classifications
B; B23; B23K; B23K13/00; B23K13/04; B23K13/043; H; H05; H05B; H05B6/00; H05B6/02; H05B6/36; H05B6/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2066668A
Cited
US2167554A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |