Patent US4672422A successfully refreshed from Google Patents.
US3138765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triode parametric amplifier
Assignee: AT&T Inc
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Filing: 1960-02-01
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Granted: 1964-06-23
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Expires: 1980-02-01
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Bridges
- 👤 Charles F Hempstead
- 👤 Calvin F Quate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:55
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/54; H03F7/00; H03F7/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
127 words
AN ELECTRON DISCHARGE DEVICE COMPRISING A CATHODE, FORAMINOUS GRID, AND ANODE, CATHODE CAVITY RESONATOR MEANS INCLUDING SAID GRID, ANODE CAVITY RESONATOR MEANS INCLUDING SAID GRID, MEANS FOR VARYING THE GRID-ANODE CAPACITANCE COMPRISING MEANS FOR APPLYING PUMP ENERGY TO SAID CATHODE CAVITY MEANS, SAID CATHODE CAVITY RESONATOR BEING RESONANT AT THE FREQUENCY OF THE PUMP ENERGY, MEANS FOR ABSTRACTING OUTPUT ENERGY FROM SAID ANODE CAVITY RESONATOR MEANS, SAID ANODE CAVITY RESONATOR MEANS BEING RESONANT AT THE FREQUENCY OF SAID OUTPUT ENERGY, THE PUMP ENERGY FREQUENCY AND THE OUTPUT ENERGY FREQUENCY SATISFYING THE CONDITION FP=FS+FI, WHERE FP IS THE PUMP ENERGY FREQUENCY, AND EITHER OR BOTH FS AND FI ARE THE OUTPUT ENERGY FREQUENCIES, AND MEANS FOR MAINTAINING SAID ANODE AT A NEGATIVE POTENTIAL WITH RESPECT TO SAID GRID.
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) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |