US4254388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency selector apparatus
Assignee: AVON HI-LIFE Inc
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Filing: 1979-09-12
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Granted: 1981-03-03
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Expires: 1999-09-12
Abstract
Abstract A frequency selector apparatus wherein unidirectional input and output surface-acoustic-wave transducers are provided in an acoustic wave propagation path formed on a piezoelectric device and reflecting electrodes, to which a.c. signals are applied respectively, are disposed in the acoustic wave propagation path on opposite sides of the transducers and adjacent thereto.
Inventors
- 👤 Nobuo Mikoshiba
- 👤 Shoichi Minagawa
- 👤 Takeshi Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:23
CPC Classifications
H; H03; H03F; H03F13/00; G; G10; G10K; G10K11/00; G10K11/36; H03F7/00; H03F7/04; H03H; H03H9/00; H03H9/02; H03H9/125; H03H9/145; H03H9/14502; H03H9/14508
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
58 words
A frequency selector apparatus which comprises: a piezoelectric device; unidirectional input and output surface-acoustic-wave transducers each disposed in an acoustic wave propagation path on said piezoelectric device; reflecting electrodes each disposed in said acoustic wave propagation path on opposite sides of said transducers adjacent thereto; and means for applying an a.c. signal to each of said reflecting electrodes.
Claim 2
Dependent Claim
58 words
A frequency selector apparatus which comprises: a piezoelectric device; unidirectional input and output surface-acoustic-wave transducers each disposed in an acoustic wave propagation path on said piezoelectric device; reflecting electrodes each disposed in said acoustic wave propagation path on opposite sides of said transducers adjacent thereto; and means for applying an a.c. signal to each of said reflecting electrodes.
Claim 3
Dependent Claim
24 words
A frequency selector apparatus of claim 1, wherein said piezoelectric device is made of a laminate of a semiconductor layer and a piezoelectric layer.
Claim 4
Dependent Claim
39 words
A frequency selector apparatus of claim 1, wherein said unidirectional input surface-acoustic-wave transducer has a phase shifter connected between two input terminals thereof and said unidirectional output surface-acoustic-wave transducer has a phase shifter connected between two output terminals thereof.
Claim 5
Dependent Claim
23 words
A frequency selector apparatus of claim 1, wherein said means for applying said a.c. signals includes an oscillator whose oscillation frequency is variable.
Claim 6
Dependent Claim
20 words
A frequency selector apparatus of claim 1, wherein said means for applying said a.c. signals includes a highly stable oscillator.
References Cited (Backward Citations)
US3925653A
Cited
US4162466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |