US2830205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High efficiency constant speed direct current motor
Assignee: Individual
•
Filing: 1955-03-28
•
Granted: 1958-04-08
•
Expires: 1975-03-28
Abstract
No abstract record available.
Inventors
- 👤 Castagna John Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:49
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/06; H01H35/10; H02; H02K; H02K23/00; H02K23/66; Y; Y10; Y10S; Y10S464/00; Y10S464/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1587763A
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US2103589A
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US2237916A
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US2295305A
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US2345429A
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US2617904A
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US2738391A
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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) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |