Patent US2429903A successfully refreshed from Google Patents.
US2429903A
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US
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Ventilation of small electric motors
Assignee: Singer Co
•
Filing: 1943-10-19
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Granted: 1947-10-28
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Expires: 1963-10-19
Abstract
No abstract record available.
Inventors
- 👤 Philip H Trickey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:10
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/02; H02K9/04; H02K9/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US482389A
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US727686A
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US819820A
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US1267983A
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US1261386A
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US1677433A
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US1907230A
Cited
US2171321A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-27 | 1951-04-28 | 1951-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-27 | 1955-04-28 | 1955-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-27 | 1959-04-28 | 1959-10-28 | $7700.00 | Window Closed / Lapsed |