US3522519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic chopper utilizing a field effect transistor switch
Assignee: V H P J KIPP AND ZONEN NV
•
Filing: 1967-07-10
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Granted: 1970-08-04
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Expires: 1987-07-10
Abstract
No abstract record available.
Inventors
- 👤 Berthus Petersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:38
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/38; H03F3/387; H03F3/393; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3406327A
Cited
US3397353A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-03 | 1974-02-02 | 1974-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-03 | 1978-02-02 | 1978-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-03 | 1982-02-02 | 1982-08-04 | $7700.00 | Window Closed / Lapsed |