US3521138A
Expired / Lapsed
US
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Thermal starting device for a singlephase asynchronous motor
Assignee: Danfoss AS
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Filing: 1968-04-02
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Granted: 1970-07-21
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Expires: 1988-04-02
Abstract
No abstract record available.
Inventors
- 👤 Arne F Enemark
- 👤 Holger V Vind
- 👤 Andreas T Schack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:19
CPC Classifications
H; H01; H01H; H01H61/00; H01H61/02; H02; H02P; H02P1/00; H02P1/16; H02P1/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |