Patent US3665225A successfully refreshed from Google Patents.
US3665225A
Expired / Lapsed
US
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Hybrid surface-wave transducer
Assignee: IIT Research Institute
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Filing: 1970-08-28
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Granted: 1972-05-23
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Expires: 1990-08-28
Abstract
Abstract A transducer for generating and detecting surface elastic waves in a non-piezoelectric material may include an interdigital electrode array coupled to a piezoelectric crystal. The crystal is mechanically coupled to the non-piezoelectric material through an acoustical transmissive medium.
Inventors
- 👤 Anthony P Van Den Heuvel
- 👤 Ronald B Owen
- 👤 Shrinivas G Joshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:52
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/125; H03H9/145; H03H9/14502; H03H9/02535; H03H9/02543; H03H9/02574
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
88 words
A device for transducing signals between an electrical mode in an electric circuit and an elastic surface-wave mode in a nonpiezoelectric material, comprising an interdigital electrode array adapted for connection to said circuit and being electrically coupled to one surface of a piezoelectric material for transduction of elastic surface-waves between said array and said surface of the piezoelectric material, and means for mechanically coupling at least a portion of said one surface of the piezoelectric material to at least a portion of a surface of said non-piezoelectric material.
Claim 2
Independent Claim
88 words
A device for transducing signals between an electrical mode in an electric circuit and an elastic surface-wave mode in a nonpiezoelectric material, comprising an interdigital electrode array adapted for connection to said circuit and being electrically coupled to one surface of a piezoelectric material for transduction of elastic surface-waves between said array and said surface of the piezoelectric material, and means for mechanically coupling at least a portion of said one surface of the piezoelectric material to at least a portion of a surface of said non-piezoelectric material.
Claim 3
Dependent Claim
37 words
The device of claim 1 wherein said mechanical coupling means comprises an acoustical transmissive medium physically disposed between said portion of said surface of said piezoelectric material and said portion of said surface of the non-piezoelectric material.
Claim 4
Dependent Claim
15 words
The device of claim 2 wherein said acoustical transmissive medium is in a liquid state.
Claim 5
Dependent Claim
21 words
The device of claim 3 wherein said liquid is selected from the group consisting of ethyl alcohol, trichloroethylene, water and acetone.
Claim 6
Dependent Claim
11 words
The device of claim 3 wherein said liquid is an oil.
Claim 7
Dependent Claim
13 words
The device of claim 2 wherein said acoustical transmissive medium is phenyl benzoate.
Claim 8
Dependent Claim
14 words
The device of claim 6 wherein the phenyl benzoate is in a liquid state.
Claim 9
Dependent Claim
19 words
The device of claim 1 wherein the respective surface portions of said piezoelectric and non-piezoelectric material are mutually parallel.
Claim 10
Dependent Claim
18 words
The device of claim 8 wherein said interdigital array defines a plane parallel to said respective surface portions.
Claim 11
Dependent Claim
19 words
The device of claim 1 wherein said interdigital electrode array is disposed on said surface of said non-piezoelectric material.
Claim 12
Dependent Claim
34 words
The device of claim 1 wherein said surface portions of the piezoelectric material and said non-piezoelectric material in the region of mechanical coupling therebetween are spaced no greater than a distance of 10 micrometers.
Claim 13
Dependent Claim
12 words
The device of claim 1 wherein said piezoelectric material is lithium niobate.
Claim 14
Dependent Claim
71 words
An ultrasonic surface-wave transducer for non-piezoelectric materials comprising a piezoelectric crystal, electrode means for coupling a spatially periodic fringing field to a surface of said piezoelectric crystal for transduction of elastic surface-waves on said surface of the piezoelectric crystal, and an acoustical transmissive medium physically disposed between at least a portion of said surface of the piezoelectric crystal and a surface of the non-piezoelectric material to provide a mechanical coupling therebetween.
Claim 15
Dependent Claim
71 words
An ultrasonic surface-wave transducer for non-piezoelectric materials comprising a piezoelectric crystal, electrode means for coupling a spatially periodic fringing field to a surface of said piezoelectric crystal for transduction of elastic surface-waves on said surface of the piezoelectric crystal, and an acoustical transmissive medium physically disposed between at least a portion of said surface of the piezoelectric crystal and a surface of the non-piezoelectric material to provide a mechanical coupling therebetween.
Claim 16
Dependent Claim
13 words
The transducer of claim 13 wherein said acoustical transmissive medium is a liquid.
Claim 17
Dependent Claim
27 words
The transducer of claim 13 wherein said surface portion of the piezoelectric material is spaced from the non-piezoelectric surface by a distance of the order of micrometers.
Claim 18
Independent Claim
73 words
A method of transducing signals between an electrical mode and an elastic surface-wave mode in a non-piezoelectric material, comprising the steps of coupling a spatially periodic fringing electric field to a surface of a piezoelectric crystal for transduction of elastic surface-waves on said surface of the crystal, and mechnically coupling at least a portion of said surface of the piezoelectric crystal to a surface of the non-piezoelectric material with an acoustical transmissive medium.
Claim 19
Independent Claim
73 words
A method of transducing signals between an electrical mode and an elastic surface-wave mode in a non-piezoelectric material, comprising the steps of coupling a spatially periodic fringing electric field to a surface of a piezoelectric crystal for transduction of elastic surface-waves on said surface of the crystal, and mechnically coupling at least a portion of said surface of the piezoelectric crystal to a surface of the non-piezoelectric material with an acoustical transmissive medium.
Claim 20
Dependent Claim
13 words
The method of claim 16 wherein the acoustical transmissive medium is a liquid.
Claim 21
Dependent Claim
29 words
The method of claim 16 whereiN said surface portion of the piezoelectric crystal is spaced from the surface of the non-piezoelectric material a distance of the order of micrometers.
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |