US2974242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-inertia induction motor rotor
Assignee: Individual
•
Filing: 1957-01-22
•
Granted: 1961-03-07
•
Expires: 1977-01-22
Abstract
No abstract record available.
Inventors
- 👤 Apstein Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:12
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/16; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/278; H02K5/00; H02K5/04; H02K5/16; H02K5/173; H02K5/1732; H02K7/00; H02K7/08; H02K7/083
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US295534A
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CA512477A
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US1595550A
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US1576002A
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GB501432A
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US2159768A
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US2300482A
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US2542659A
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US2402214A
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US2492678A
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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) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |