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US2447339A
Expired / Lapsed
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Cooling of electric machines
Assignee: ELECTRICAL ENGINEERING AND Manufacturing
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Filing: 1945-11-13
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Granted: 1948-08-17
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Expires: 1965-11-13
Abstract
No abstract record available.
Inventors
- 👤 Vaino A Hoover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:28
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)
SE60125C1
Cited
US923673A
Cited
US1170192A
Cited
CH106317A
Cited
AT109516B
Cited
US1784102A
Cited
US2301156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-17 | 1952-02-16 | 1952-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-17 | 1956-02-16 | 1956-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-17 | 1960-02-16 | 1960-08-17 | $7700.00 | Window Closed / Lapsed |