Patent US4090153A successfully refreshed from Google Patents.
US4090153A
Expired / Lapsed
US
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Surface acoustic wave absorber
Assignee: RCA Corp
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Filing: 1976-06-07
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Granted: 1978-05-16
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Expires: 1996-06-07
Abstract
Abstract The surface acoustic waves reflecting from the edges of a surface acoustic wave device, designed for low frequency application, are attenuated by placing an epoxy resin or a powder-epoxy resin mixture near the edge of the surface acoustic wave device.
Inventors
- 👤 Minoru Toda
- 👤 Susumu Osaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:31
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02535; H03H9/02818; H03H9/02842; G; G10; G10K; G10K11/00; G10K11/36; H03H3/00; H03H3/007; H03H3/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
33 words
A surface acoustic wave device comprising a piezoelectric substrate, a pair of transducers having leads on said substrate and a surface acoustic wave absorber comprising an epoxy resin admixed with a powder filler.
Claim 2
Dependent Claim
33 words
A surface acoustic wave device comprising a piezoelectric substrate, a pair of transducers having leads on said substrate and a surface acoustic wave absorber comprising an epoxy resin admixed with a powder filler.
Claim 3
Dependent Claim
40 words
The device of claim 1, wherein said surface acoustic wave absorber is at opposite edges of said substrate and a pair of interdigitated transducers is between said opposite edges and the acoustic wave absorber is at least between said leads.
Claim 4
Dependent Claim
32 words
The device of claim 1, wherein the powder filler is selected from the group consisting of Ni, Al 2 O 3 , Bi 2 O 3 , WO 3 , and cement.
Claim 5
Dependent Claim
19 words
The device of claim 1, wherein the powder filler has a particle size of from 2 to 50 microns.
Claim 6
Dependent Claim
23 words
The device of claim 1, wherein cement and epoxy resin in a ratio of 2.6:1 is used as the power filler-epoxy resin mixture.
Claim 7
Independent Claim
62 words
A method of attenuating the surface acoustic waves reflecting from the edges of a surface acoustic wave device comprising a piezoelectric substrate, at least one transducer having leads on said piezoelectric substrate and designed for low frequency application, which comprises placing an epoxy resin admixed with a power filler between adjacent electrode leads near the edge of said surface acoustic wave device.
Claim 8
Independent Claim
62 words
A method of attenuating the surface acoustic waves reflecting from the edges of a surface acoustic wave device comprising a piezoelectric substrate, at least one transducer having leads on said piezoelectric substrate and designed for low frequency application, which comprises placing an epoxy resin admixed with a power filler between adjacent electrode leads near the edge of said surface acoustic wave device.
Claim 9
Dependent Claim
19 words
A method of claim 6, wherein the surface wave acoustic device operates at a frequency of about 10.7 MHz.
Claim 10
Dependent Claim
32 words
The method of claim 6 wherein said powder filler is selected from the group consisting of cement, nickel, silver, Al 2 O 3 and Bi 2 O 3 and WO 3 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |