Patent US2521740A successfully refreshed from Google Patents.
US2521740A
Expired / Lapsed
US
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Electromagnetic cutting torch
Assignee: OHIC CRANKSHAFT Co
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Filing: 1947-10-30
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Granted: 1950-09-12
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Expires: 1967-10-30
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry B Osborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:34
CPC Classifications
B; B23; B23K; B23K13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |