Patent US2500189A successfully refreshed from Google Patents.
US2500189A
Expired / Lapsed
US
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Saturable magnetic shunt controller
Assignee: Lincoln Electric Co
•
Filing: 1944-10-09
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Granted: 1950-03-14
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Expires: 1964-10-09
Abstract
No abstract record available.
Inventors
- 👤 George G Landis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:18
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/32; G05F1/325
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US735103A
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US2306578A
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US2210714A
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US2228731A
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US2346997A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |