Patent US1450897A successfully refreshed from Google Patents.
US3538342A
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Device for controlling an inverter
Assignee: Danfoss AS
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Filing: 1968-08-28
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Granted: 1970-11-03
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Expires: 1988-08-28
Abstract
No abstract record available.
Inventors
- 👤 Arne Jensen
- 👤 Tom Kastrup Petersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:07
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/153; A; A47; A47J; A47J43/00; A47J43/04; A47J43/046; A47J43/0465; A47J43/07; A47J43/08; A47J43/085; F; F24; F24C; F24C7/00; F24C7/08; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/5152; H02M7/5155; H03K5/01; H03K5/1536
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) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |