Patent US2772384A successfully refreshed from Google Patents.
US2772384A
Expired / Lapsed
US
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Speed control for a. c. motors
Assignee: Individual
•
Filing: 1950-12-28
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Granted: 1956-11-27
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Expires: 1970-12-28
Abstract
No abstract record available.
Inventors
- 👤 Unterreiner Josef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:54
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US953219A
Cited
US1767146A
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GB361107A
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US1954884A
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US1979890A
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US2102911A
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US2281711A
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US2353314A
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US2500190A
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US2493140A
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US2462751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-27 | 1960-05-28 | 1960-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-27 | 1964-05-28 | 1964-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-27 | 1968-05-28 | 1968-11-27 | $7700.00 | Window Closed / Lapsed |