US3311799A
Expired / Lapsed
US
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Semiconductor barrier layer switch with symmetrical characteristics on either polarity
Assignee: Siemens Mobility Ltd
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Filing: 1960-07-06
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Granted: 1967-03-28
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Expires: 1980-07-06
Abstract
No abstract record available.
Inventors
- 👤 Brian J Gumm
- 👤 Clifford V H Miles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:50
CPC Classifications
H; H10; H10W; H10W99/00; H10D; H10D99/00; H10P; H10P95/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2980810A
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US2966434A
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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) | 1970-03-27 | 1970-09-26 | 1971-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-27 | 1974-09-26 | 1975-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-27 | 1978-09-26 | 1979-03-28 | $7700.00 | Window Closed / Lapsed |