Patent US2509935A successfully refreshed from Google Patents.
US2509935A
Expired / Lapsed
US
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Protective means for electrical instrumentalities
Assignee: McGraw Electric Co
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Filing: 1946-04-13
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Granted: 1950-05-30
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Expires: 1966-04-13
Abstract
No abstract record available.
Inventors
- 👤 Rolland D Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:23
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/40; H01F27/402; H01F27/404
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1548733A
Cited
US1740477A
Cited
US2042421A
Cited
GB491200A
Cited
US2376789A
Cited
US2351969A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |