US2908871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative resistance semiconductive apparatus
Assignee: AT&T Inc
•
Filing: 1954-10-26
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Granted: 1959-10-13
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Expires: 1974-10-26
Abstract
No abstract record available.
Inventors
- 👤 Kenneth G Mckay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:35
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/787; H03F; H03F3/00; H03F3/04; H03F3/14; H10; H10D; H10D99/00; H10P; H10P95/00; Y; Y10; Y10S; Y10S148/00; Y10S148/151
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2402662A
Cited
US2670441A
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US2794863A
Cited
US2623105A
Cited
US2790037A
Cited
US2711379A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-12 | 1963-04-13 | 1963-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-12 | 1967-04-13 | 1967-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-12 | 1971-04-13 | 1971-10-13 | $7700.00 | Window Closed / Lapsed |