Patent US3426827A successfully refreshed from Google Patents.
US3219941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonreciprocal wide-band parametric amplifier
Assignee: AT&T Inc
•
Filing: 1963-06-13
•
Granted: 1965-11-23
•
Expires: 1983-06-13
Abstract
No abstract record available.
Inventors
- 👤 Rudolf S Engelbrecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:12
CPC Classifications
H; H03; H03F; H03F7/00; H03F7/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A PARAMETRIC AMPLIFIER COMPRISING, IN COMBINATION, A DIRECTIONAL COUPLER HAVING FIRST AND SECOND PAIRS OF CONJUGATE ARMS, SAID S ECOND PAIR OF CONJUGATE ARMS BEING ORIENTED TO CROSS EACH OTHER AT RIGHT ANGLES AT A POINT ALONG THEIR LENGTHS, A MAGNETICALLY POLARIZED ELEMENT OF GYROMAGNETIC MATERIAL LOCATED AT THE POINT OF INTERSECTION OF SAID SECOND PAIR AND BEING ELECTROMAGNERICALLY COUPLED TO BOTH ARMS OF SAID SECOND PAIR, A VARIABLE CAPACITANCE DEVICE CONNECTED TO EACH OF THE ARM OF THE SAID SECOND PAIR BETWEEN SAID COUPLER AND SAID POINT OF INTERSECTION, AND MEANS FOR COUPLING PUMP ENERGY TO EACH OF SAID VARIABLE CAPACITANCE DEVICES FOR VARYING THE CAPACITANCE THEREOF.
Claim 2
Dependent Claim
108 words
A PARAMETRIC AMPLIFIER COMPRISING, IN COMBINATION, A DIRECTIONAL COUPLER HAVING FIRST AND SECOND PAIRS OF CONJUGATE ARMS, SAID S ECOND PAIR OF CONJUGATE ARMS BEING ORIENTED TO CROSS EACH OTHER AT RIGHT ANGLES AT A POINT ALONG THEIR LENGTHS, A MAGNETICALLY POLARIZED ELEMENT OF GYROMAGNETIC MATERIAL LOCATED AT THE POINT OF INTERSECTION OF SAID SECOND PAIR AND BEING ELECTROMAGNERICALLY COUPLED TO BOTH ARMS OF SAID SECOND PAIR, A VARIABLE CAPACITANCE DEVICE CONNECTED TO EACH OF THE ARM OF THE SAID SECOND PAIR BETWEEN SAID COUPLER AND SAID POINT OF INTERSECTION, AND MEANS FOR COUPLING PUMP ENERGY TO EACH OF SAID VARIABLE CAPACITANCE DEVICES FOR VARYING THE CAPACITANCE THEREOF.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |