US3218564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonreciprocal parametric amplifier
Assignee: AT&T Inc
•
Filing: 1963-11-22
•
Granted: 1965-11-16
•
Expires: 1983-11-22
Abstract
No abstract record available.
Inventors
- 👤 Seidel Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:14
CPC Classifications
H; H03; H03F; H03F7/00; H03F7/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A NONRECIPROCAL PARAMETERIC AMPLIFIER COMPRISING: A PAIR OF 3 DB HYBRIDS EACH HAVING TWO PAIRS OF CONJUGATE BRANCHES; MEANS FOR CONNECTING ONE PAIR OF CONJUGATE BRANCHES OF ONE OF SAID HYBRIDS TO ONE PAIR OF CONJUGATE BRANCHES OF THE OTHER OF SAID HYBRIDS; VARIABLE REACTANCE MEANS COUPLED TO EACH OF SAID CONNECTING MEANS; MEANS FOR APPLYING PUMPING POWER TO SAID REACTANCE MEANS THEREBY PRODUCING UPPER AND LOWER SIDEBAND FREQUENCIES; MEANS FOR REACTIVELY TERMINATING ONE BRANCH OF THE OTHER PAIR OF CONJUGATE BRANCHES OF ONE OF SAID HYBRIDS FOR SAID SIDEBAND FREQUENCIES; AND MEANS FOR RESISTIVELY TERMINATING THE SECOND BRANCH OF THE OTHER PAIR OF CONJUGATE BRANCHES OF SAID ONE HYBRID FOR SAID SIDEBAND FREQUENCIES.
Claim 2
Dependent Claim
114 words
A NONRECIPROCAL PARAMETERIC AMPLIFIER COMPRISING: A PAIR OF 3 DB HYBRIDS EACH HAVING TWO PAIRS OF CONJUGATE BRANCHES; MEANS FOR CONNECTING ONE PAIR OF CONJUGATE BRANCHES OF ONE OF SAID HYBRIDS TO ONE PAIR OF CONJUGATE BRANCHES OF THE OTHER OF SAID HYBRIDS; VARIABLE REACTANCE MEANS COUPLED TO EACH OF SAID CONNECTING MEANS; MEANS FOR APPLYING PUMPING POWER TO SAID REACTANCE MEANS THEREBY PRODUCING UPPER AND LOWER SIDEBAND FREQUENCIES; MEANS FOR REACTIVELY TERMINATING ONE BRANCH OF THE OTHER PAIR OF CONJUGATE BRANCHES OF ONE OF SAID HYBRIDS FOR SAID SIDEBAND FREQUENCIES; AND MEANS FOR RESISTIVELY TERMINATING THE SECOND BRANCH OF THE OTHER PAIR OF CONJUGATE BRANCHES OF SAID ONE HYBRID FOR SAID SIDEBAND FREQUENCIES.
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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |