US2726370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative impedance converters employing transistors
Assignee: AT&T Inc
•
Filing: 1952-09-17
•
Granted: 1955-12-06
•
Expires: 1972-09-17
Abstract
No abstract record available.
Inventors
- 👤 John G Linvill
- 👤 Jr Robert L Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:25
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/16; H04B3/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2569347A
Cited
US2582498A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-05 | 1959-06-06 | 1959-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-05 | 1963-06-06 | 1963-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-05 | 1967-06-06 | 1967-12-06 | $7700.00 | Window Closed / Lapsed |