Patent US2702871A successfully refreshed from Google Patents.
US2702871A
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Electric motor, including an impedance and cooling means therefor
Assignee: BIRTMAN ELECTRIC Co
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Filing: 1951-04-20
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Granted: 1955-02-22
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Expires: 1971-04-20
Abstract
No abstract record available.
Inventors
- 👤 Charles H Sparklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:24
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/66
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US682323A
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US1587760A
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FR676838A
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US2017255A
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US2064388A
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US2182083A
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US2240664A
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US2391964A
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US2432067A
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FR918519A
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US2512902A
Cited
US2521654A
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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) | 1958-02-21 | 1958-08-23 | 1959-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-21 | 1962-08-23 | 1963-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-21 | 1966-08-23 | 1967-02-22 | $7700.00 | Window Closed / Lapsed |