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US2915647A
Expired / Lapsed
US
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Semiconductive switch and negative resistance
Assignee: AT&T Inc
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Filing: 1955-07-13
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Granted: 1959-12-01
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Expires: 1975-07-13
Abstract
No abstract record available.
Inventors
- 👤 Jewell J Ebers
- 👤 Solomon L Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:18
CPC Classifications
H; H10; H10D; H10D99/00; H10D8/00; H10D8/20; H10D8/25; H10D84/00; H10D84/60; H10D84/645
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) | 1962-11-30 | 1963-06-01 | 1963-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-30 | 1967-06-01 | 1967-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-30 | 1971-06-01 | 1971-12-01 | $7700.00 | Window Closed / Lapsed |