US2667607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor circuit element
Assignee: AT&T Inc
•
Filing: 1952-04-26
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Granted: 1954-01-26
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Expires: 1972-04-26
Abstract
No abstract record available.
Inventors
- 👤 Albert L Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:36
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/74; H03K17/76; H10; H10D; H10D99/00; Y; Y10; Y10S; Y10S257/00; Y10S257/909
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) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |