US4023120A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface wave programmable oscillator
Assignee: Thales SA
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Filing: 1976-02-27
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Granted: 1977-05-10
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Expires: 1996-02-27
Abstract
Abstract The present invention relates to surface elastic wave programmable oscillators. The oscillator in accordance with the invention comprises an amplifier and a feedback loop comprising a selective surface wave transmission system which offers N possibilities of energy exchange between a transducer array with curved teeth, and a set of auxiliary transducers arranged in a fantail fashion.
Inventors
- 👤 Pierre Hartemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:34
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/70; H03H9/72; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/326; H03H9/02; H03H9/125; H03H9/145; H03H9/14544; H03H9/14555; H03H9/14561
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
A surface wave programmable oscillator comprising: a frequency selective transmission system, ampifier means having respective input and output terminals, and N positions switching means; said frequency selective transmission system comprising a piezoelectric substrate, an electromechanical transducer array for launching along the surface of said substrate a beam of ultrasonic energy, and a set of N auxiliary surface wave transducers arranged on said surface in fantail fashion for successively collecting said beam of ultrasonic energy; one of said terminals being connected to said electromechanical transducer array, and the other of said terminals being connected through the agency of said N positions switching means respectively to said N auxiliary surface wave transducers; said electromechanical transducer array comprising electrode means in the for of interdigitated comb shaped structures with curvilinear teeth.
Claim 2
Dependent Claim
128 words
A surface wave programmable oscillator comprising: a frequency selective transmission system, ampifier means having respective input and output terminals, and N positions switching means; said frequency selective transmission system comprising a piezoelectric substrate, an electromechanical transducer array for launching along the surface of said substrate a beam of ultrasonic energy, and a set of N auxiliary surface wave transducers arranged on said surface in fantail fashion for successively collecting said beam of ultrasonic energy; one of said terminals being connected to said electromechanical transducer array, and the other of said terminals being connected through the agency of said N positions switching means respectively to said N auxiliary surface wave transducers; said electromechanical transducer array comprising electrode means in the for of interdigitated comb shaped structures with curvilinear teeth.
Claim 3
Dependent Claim
61 words
An oscillator as claimed in claim 1, wherein said N positions switching means comprise N switching circuits respectively connected to said N auxiliary surface wave transducers and a biasing circuit; each said switching circuits comprising at least one diode; said diode being driven into conduction by said biasing circuit for causing said oscillator to oscillate at anyone of N distinct frequencies.
Claim 4
Dependent Claim
67 words
An oscillator as claimed in claim 2, wherein each said N switching circuits comprises a further diode connected across the corresponding one of said N auxiliary surface wave transducers; said further diode being driven into conduction by said biasing circuit each time said at least one diode is in its non-conducting state, for preventing said oscillator from oscillating at more than one of said N distinct frequencies.
Claim 5
Dependent Claim
13 words
An oscillator as claimed in claim 3, wherein said diodes are semiconductor devices.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |