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Patent US2693543A successfully refreshed from Google Patents.
US2693543A
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Commutator cooling
Assignee: Jack and Heintz Inc
•
Filing: 1952-05-19
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Granted: 1954-11-02
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Expires: 1972-05-19
Abstract
No abstract record available.
Inventors
- 👤 Cecil G Martin
- 👤 John R Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:28
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1578539A
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US1684168A
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GB290043A
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FR679203A
Cited
US2074067A
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US2315177A
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US2379176A
Cited
US2560784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-01 | 1958-05-03 | 1958-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-01 | 1962-05-03 | 1962-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-01 | 1966-05-03 | 1966-11-02 | $7700.00 | Window Closed / Lapsed |