Patent US3562657A successfully refreshed from Google Patents.
US3562657A
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Parametric amplifier circuit for microwave frequencies
Assignee: Telefunken Patentverwertungs GmbH
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Filing: 1969-05-29
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Granted: 1971-02-09
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Expires: 1989-05-29
Abstract
Abstract A NONRECIPROCAL PARAMETRIC MIRCOWAVE FREQUENCY AMPLIFIER CIRCUIT COMPOSED OF TWO MIXER CASCADE AMPLIFIERS CONNECTED IN SERIES AND PRESENTING SIMULTANEOUS POWER AND NOISE MATCHING BY AN APPROPRIATE SELECTION OF THE ELECTRICAL VALUES OF THE CIRCUIT.
Inventors
- 👤 Karl-Heinz Locherer
- 👤 Robert Maurer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:28
CPC Classifications
H; H03; H03F; H03F7/00; H03F7/04
Claims Analysis
Total Claims: 0
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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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |