Patent US2498747A successfully refreshed from Google Patents.
US2498747A
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Electromagnetic device and method of making the same
Assignee: McGraw Electric Co
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Filing: 1944-09-20
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Granted: 1950-02-28
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Expires: 1964-09-20
Abstract
No abstract record available.
Inventors
- 👤 David E Wiegand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:07
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F30/00; H01F30/06; H01F30/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49078
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US523572A
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US644565A
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US714891A
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US999825A
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US1935426A
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US2220732A
Cited
US2305649A
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US2324115A
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US2344006A
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US2401952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-27 | 1953-08-29 | 1954-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-27 | 1957-08-29 | 1958-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-27 | 1961-08-29 | 1962-02-28 | $7700.00 | Window Closed / Lapsed |