US2444077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyphase induction machine and control
Assignee: Vickers Inc
•
Filing: 1944-03-07
•
Granted: 1948-06-29
•
Expires: 1964-03-07
Abstract
No abstract record available.
Inventors
- 👤 Weathers Eland Clay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:46
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US587937A
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US1411862A
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DE348341C
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US1628464A
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GB281712A
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US1822369A
Cited
GB471113A
Cited
US2319625A
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US2213945A
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US2209364A
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US2230731A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-29 | 1951-12-29 | 1952-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-29 | 1955-12-29 | 1956-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-29 | 1959-12-29 | 1960-06-29 | $7700.00 | Window Closed / Lapsed |