US4450420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface acoustic wave filter
Assignee: Osram Sylvania Inc
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Filing: 1982-01-13
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Granted: 1984-05-22
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Expires: 2002-01-13
Abstract
Abstract A surface acoustic wave filter comprises aluminum input and output transducers, an aluminum 3db coupler, an aluminum reflector, and a triangularly configured substrate constructed from lithium niobate. In a specific configuration the lengths of the sides of the substrate are equal to approximately 6.06, 9.25 and 11.05 millimeters respectively. The triangular configuration not only reduces the amount of substrate material required but also attenuates the degree of signal reflection encountered.
Inventors
- 👤 Pol Buckinx
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:15
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02535; H03H9/02543; H03H9/02818; H03H9/02842; H03H9/0285
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
60 words
In a surface acoustic wave filter comprising an input transducer, an output transducer, a 3db coupler and a reflector, all of the above deposited on the surface of a piezoelectric substrate, the improvement comprising a substrate exhibiting a triangular perimeter, whereby the triangular substrate configuration reduces both the amount of substrate material required and the degree of signal reflection encountered.
Claim 2
Dependent Claim
60 words
In a surface acoustic wave filter comprising an input transducer, an output transducer, a 3db coupler and a reflector, all of the above deposited on the surface of a piezoelectric substrate, the improvement comprising a substrate exhibiting a triangular perimeter, whereby the triangular substrate configuration reduces both the amount of substrate material required and the degree of signal reflection encountered.
Claim 3
Dependent Claim
26 words
An improvement as defined in claim 1 wherein the triangularly configured substrate comprises sides of length approximately equal to 6.05 millimeters, 9.25 millimeters and 11.05 millimeters.
Claim 4
Dependent Claim
15 words
An improvement as defined in claim 2 wherein the substrate is comprised of lithium niobate.
Claim 5
Dependent Claim
18 words
An improvement as defined in claim 3 wherein the substrate thickness varies from approximately 0.1 to 1.0 millimeter.
Claim 6
Dependent Claim
24 words
An improvement as defined in claim 4 wherein the input transducer, the output transducer, the 3db coupler and the reflector are comprised of aluminum.
Claim 7
Dependent Claim
20 words
A surface acoustic wave filter comprising: an input transducer, an output transducer, a coupler, a reflector, and a triangular substrate.
Claim 8
Dependent Claim
20 words
A surface acoustic wave filter comprising: an input transducer, an output transducer, a coupler, a reflector, and a triangular substrate.
Claim 9
Dependent Claim
35 words
A surface acoustic wave as defined in claim 6 wherein the length of the three sides of the substrate vary between 7.0 and 12.0 millimeters, 3.0 and 12.3 millimeters, and 7.6 and 17.2 millimeters respectively.
Claim 10
Dependent Claim
18 words
A surface acoustic wave filter as defined in claim 7 wherein the substrate is constructed from lithium niobate.
Claim 11
Dependent Claim
20 words
A surface acoustic wave filter as defined in claim 8 wherein the substrate thickness varies between 0.1 and 1.0 millimeter.
Claim 12
Dependent Claim
38 words
A surface acoustic wave filter as defined in either claim 6, claim 7, claim 8 or claim 9 wherein the length of the sides of the substrate are approximately equal to 6.05 millimeters, 9.25 millimeters and 11.05 millimeters.
References Cited (Backward Citations)
US4247835A
Cited
US4350963A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |