US4470026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustical wax on a surface wave device
Assignee: Osram Sylvania Inc
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Filing: 1982-02-01
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Granted: 1984-09-04
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Expires: 2002-02-01
Abstract
Abstract A surface acoustic wave (SAW) filter partially coated with an acoustical wax, such as one soluble in trichlorethylene, or with an epoxy paint dramatically improves the performance of the filter, especially with regard to the attenuation of out-of-band signals. The coating pattern may be initially empirically determined depending on the substrate and transducer configuration but once determined is readily amenable to known printing and stamping techniques.
Inventors
- 👤 Pol Buckinx
- 👤 Mieke Jacobs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:32
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/64; G; G10; G10K; G10K11/00; G10K11/36; H03H3/00; H03H3/007; H03H3/08; H03H3/10; H03H9/02; H03H9/02535; H03H9/02543; H03H9/02818; H03H9/02842; H03H9/0285
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
A surface acoustic wave filter comprising: a generally triangularly-configured piezoelectric substrate, an electrically conductive input transducer deposited on the substrate, an electrically conductive output transducer deposited on the substrate, an electrically conductive third transducer deposited on the substrate and positioned generally intermediate the input and the output transducers, and an acoustic wax coating covering at least a moiety of the filter, including portions of the substrate, the input transducer, and the third transducer.
Claim 2
Dependent Claim
73 words
A surface acoustic wave filter comprising: a generally triangularly-configured piezoelectric substrate, an electrically conductive input transducer deposited on the substrate, an electrically conductive output transducer deposited on the substrate, an electrically conductive third transducer deposited on the substrate and positioned generally intermediate the input and the output transducers, and an acoustic wax coating covering at least a moiety of the filter, including portions of the substrate, the input transducer, and the third transducer.
Claim 3
Dependent Claim
20 words
A surface acoustic wave filter as defined in claim 1 wherein the coating is a synthetic wax soluble in trichlorethylene.
Claim 4
Dependent Claim
65 words
In a surface acoustic wave filter including a piezoelectric substrate upon which are deposited an electrically conductive input transducer, and electrically conductive output transducer, and an electrically conductive third transducer, the improvement comprising an acoustic wax coating covering portions of the substrate, the input transducer, the output transducer, and the third transducer, the acoustic wax coating for enhancing the overall frequency response of the filter.
Claim 5
Dependent Claim
65 words
In a surface acoustic wave filter including a piezoelectric substrate upon which are deposited an electrically conductive input transducer, and electrically conductive output transducer, and an electrically conductive third transducer, the improvement comprising an acoustic wax coating covering portions of the substrate, the input transducer, the output transducer, and the third transducer, the acoustic wax coating for enhancing the overall frequency response of the filter.
Claim 6
Dependent Claim
17 words
An improvement as defined in claim 3 wherein the coating is a synthetic wax soluble in trichlorethylene.
Claim 7
Dependent Claim
73 words
A surface acoustic wave filter comprising: a generally triangularly-configured piezoelectric substrate, an electrically conductive input transducer deposited on the substrate, an electrically conductive output transducer deposited on the substrate, an electrically conductive third transducer deposited on the substrate and positioned generally intermediate the input and the output transducers, and an epoxy paint coating covering at least a moiety of the filter, including portions of the substrate, the input transducer, and the third transducer.
Claim 8
Dependent Claim
73 words
A surface acoustic wave filter comprising: a generally triangularly-configured piezoelectric substrate, an electrically conductive input transducer deposited on the substrate, an electrically conductive output transducer deposited on the substrate, an electrically conductive third transducer deposited on the substrate and positioned generally intermediate the input and the output transducers, and an epoxy paint coating covering at least a moiety of the filter, including portions of the substrate, the input transducer, and the third transducer.
Claim 9
Dependent Claim
65 words
In a surface acoustic wave filter including a piezoelectric substrate upon which are deposited an electrically conductive input transducer, and electrically conductive output transducer, and an electrically conductive third transducer, the improvement comprising an epoxy paint coating covering portions of the substrate, the input transducer, the output transducer, and the third transducer, the epoxy paint coating for enhancing the overall frequency response of the filter.
Claim 10
Dependent Claim
65 words
In a surface acoustic wave filter including a piezoelectric substrate upon which are deposited an electrically conductive input transducer, and electrically conductive output transducer, and an electrically conductive third transducer, the improvement comprising an epoxy paint coating covering portions of the substrate, the input transducer, the output transducer, and the third transducer, the epoxy paint coating for enhancing the overall frequency response of the filter.
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) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |