US2972702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency amplifier
Assignee: AT&T Inc
•
Filing: 1958-11-13
•
Granted: 1961-02-21
•
Expires: 1978-11-13
Abstract
No abstract record available.
Inventors
- 👤 Kompfner Rudolf
- 👤 Calvin F Quate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 01:49
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2681951A
Cited
US2584597A
Cited
US2720610A
Cited
US2800602A
Cited
US2800606A
Cited
US2828439A
Cited
US2800603A
Cited
US2767259A
Cited
US2870367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-21 | 1964-08-22 | 1965-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-21 | 1968-08-22 | 1969-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-21 | 1972-08-22 | 1973-02-21 | $7700.00 | Window Closed / Lapsed |