US2957993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuits for series connected semiconductors
Assignee: Siemens Schuckertwerke AG
•
Filing: 1955-10-31
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Granted: 1960-10-25
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Expires: 1975-10-31
Abstract
No abstract record available.
Inventors
- 👤 Sichling Georg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:29
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/10; H02; H02M; H02M1/00; H02M1/08; H02M1/088; H03F; H03F3/00; H03F3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1985923A
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FR1081207A
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US2831126A
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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) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |