US2693543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Commutator cooling
Assignee: Jack and Heintz Inc
•
Filing: 1952-05-19
•
Granted: 1954-11-02
•
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 04:38
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE194847C
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GB191109201A
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CH90568A
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DE407193C
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US1578539A
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US1684168A
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GB290043A
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FR679203A
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US2074067A
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US2315177A
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US2379176A
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US2560784A
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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) | 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 |