US3676721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite surface-wave transducer
Assignee: IIT Research Institute
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Filing: 1970-08-28
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Granted: 1972-07-11
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Expires: 1990-08-28
Abstract
Abstract A transducer for generating and detecting surface elastic waves in a piezoelectric material may include a metalic grating on the material forming one electrode of the transducer and a counterelectrode separated from the grating by a dielectric layer.
Inventors
- 👤 Anthony P Van Den Heuvel
- 👤 Ronald W Richter
- 👤 Shrinivas G Joshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:05
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/125; H03H9/145; H03H9/14502
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
89 words
A device for transducing signals between an electrical mode in an electric circuit and an elastic surface-wave mode on a piezoelectric material, comprising a first conductor having a plurality of spaced apart portions disposed on a surface of the piezoelectric material, a layer of non-piezoelectric dielectric material disposed over said spaced apart portions of said first conductor, a second conductor disposed over said layer of dielectric material and spaced from said surface of the piezoelectric material, and means for coupling said first and second conductors to the electric circuit.
Claim 2
Independent Claim
89 words
A device for transducing signals between an electrical mode in an electric circuit and an elastic surface-wave mode on a piezoelectric material, comprising a first conductor having a plurality of spaced apart portions disposed on a surface of the piezoelectric material, a layer of non-piezoelectric dielectric material disposed over said spaced apart portions of said first conductor, a second conductor disposed over said layer of dielectric material and spaced from said surface of the piezoelectric material, and means for coupling said first and second conductors to the electric circuit.
Claim 3
Dependent Claim
30 words
The device of claim 1 wherein said spaced apart portions of said first conductor form discrete elongated strips disposed transversely to the direction of surface-wave propagation on said piezoelectric material.
Claim 4
Dependent Claim
13 words
The device of claim 1 wherein said first conductor has a grating configuration.
Claim 5
Dependent Claim
11 words
The device of claim 1 wherein said dielectric material is air.
Claim 6
Dependent Claim
12 words
The device of claim 1 wherein said dielectric material is a solid.
Claim 7
Dependent Claim
11 words
The device of claim 5 wherein said solid dielectric is glass.
Claim 8
Dependent Claim
21 words
The device of claim 1 wherein said first conductor is a grating electrode and said second conductor is a continuous plate.
Claim 9
Dependent Claim
13 words
The device of claim 7 wherein said grating electrode has a ladder configuration.
Claim 10
Dependent Claim
16 words
The device of claim 2 wherein said second conductor comprises a plurality of spaced apart portions.
Claim 11
Dependent Claim
44 words
The device of claim 9 wherein the spaced apart portions of said second conductor form elongated strips parallel to the strips of said first conductor and are each disposed over respective areas of said piezoelectric material between said elongated strips of said first conductor.
Claim 12
Dependent Claim
21 words
The device of claim 1 wherein said second conductor forms a ground plane relative to the surface of the piezoelectric material.
Claim 13
Dependent Claim
61 words
A surface-wave transducer comprising a piezoelectric substrate capable of supporting elastic surface-wave propagation on a surface thereof, a first conducting electrode having a plurality of spaced apart portions disposed on said surface, a non-piezoelectric dielectric layer disposed over said spaced apart portions of said first electrode, and a second conducting electrode disposed over said dielectric layer and spaced from said surface.
Claim 14
Dependent Claim
61 words
A surface-wave transducer comprising a piezoelectric substrate capable of supporting elastic surface-wave propagation on a surface thereof, a first conducting electrode having a plurality of spaced apart portions disposed on said surface, a non-piezoelectric dielectric layer disposed over said spaced apart portions of said first electrode, and a second conducting electrode disposed over said dielectric layer and spaced from said surface.
Claim 15
Dependent Claim
75 words
The transducer of claim 12 wherein said spaced apart portions of said first conductor are discrete members depending from a common conductive member, said discrete members being coplanar and defining a plane parallel to said surface of the piezoelectric substrate, and said dielectric layer being in a plane parallel to the plane of said discrete members and having an area at least coextensive with the overlying portions of said second electrode and said discrete members.
Claim 16
Dependent Claim
25 words
The transducer of claim 13 wherein said discrete members are elongated and are each disposed on said surface transversely to the direction of surface-wave propagation.
Claim 17
Dependent Claim
30 words
The transducer of claim 14 wherein said second conducting electrode comprises a plurality of spaced apart coplanar discrete members defining a plane parallel to said surface of the piezoelectric substrate.
Claim 18
Dependent Claim
13 words
The transducer of claim 12 wherein said dielectric layer is composed of air.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |