US2663796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-input impedance transistor circuits
Assignee: AT&T Inc
•
Filing: 1950-11-09
•
Granted: 1953-12-22
•
Expires: 1970-11-09
Abstract
No abstract record available.
Inventors
- 👤 Raisbeck Gordon
- 👤 Jr Robert Lee Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:04
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/56; H03F1/565
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1820114A
Cited
US1908381A
Cited
US2524035A
Cited
US2517960A
Cited
US2541322A
Cited
US2556286A
Cited
US2556296A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |