Patent US4593341A successfully refreshed from Google Patents.
US3838366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monolithic electro-mechanical filters
Assignee: Thales SA
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Filing: 1973-05-18
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Granted: 1974-09-24
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Expires: 1993-05-18
Abstract
Abstract The present invention relates to monolithic electro-mechanical filters comprising coupled resonators obtained by the deposition of electrodes upon a piezoelectric wafer. In accordance with the present invention, there is provided an electro-mechanical filter wherein the coupled resonators in two collateral transmission paths, have mutually different resonance frequencies; a step being provided in the wafer, between said transmission paths.
Inventors
- 👤 G Coussot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:17
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/54; H03H9/56
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
89 words
Electro-mechanical filter comprising: a piezo-electric wafer having two large faces, two pairs of mutually opposite electrodes arranged on said faces along a transmission path for building up two coupled resonators, and at least two further pairs of mutually opposite electrodes arranged on said faces along a further transmission path for building up two further coupled resonators, said transmission paths being collateral paths, and the resonance frequency of the resonators lying on said transmission path being different from the resonance frequency of the resonators lying on said further transmission path.
Claim 2
Dependent Claim
89 words
Electro-mechanical filter comprising: a piezo-electric wafer having two large faces, two pairs of mutually opposite electrodes arranged on said faces along a transmission path for building up two coupled resonators, and at least two further pairs of mutually opposite electrodes arranged on said faces along a further transmission path for building up two further coupled resonators, said transmission paths being collateral paths, and the resonance frequency of the resonators lying on said transmission path being different from the resonance frequency of the resonators lying on said further transmission path.
Claim 3
Dependent Claim
30 words
Electro-mechanical filter as claimed in claim 1, wherein said wafer has a non-uniform thickness; said collateral paths being located in regions of said wafer separated by at least one step.
Claim 4
Dependent Claim
31 words
Electro-mechanical filter as claimed in claim 1, wherein said electrodes located in each of said faces and at one of end of said collateral paths, are electrically connected with one another.
Claim 5
Dependent Claim
39 words
Electro-mechanical filter as claimed in claim 2, wherein said collateral paths are separated from one another by at least one step formed in at least one of said faces; the edge of said step being collateral with said paths.
Claim 6
Dependent Claim
30 words
Electro-mechanical filter as claimed in claim 3, wherein said electrodes located in each of said faces and at the other end of said paths, are electrically connected with one another.
Claim 7
Dependent Claim
107 words
Electro-mechanical filter comprising: a piezoelectric wafer having two large faces disposed obliquely in relation to one another, two pairs of mutually opposite electrodes arranged on said faces along a transmisson path for building up two coupled resonators, and at least two further pairs of mutually opposite electrodes arranged on said faces along a further transmission path for building up two further coupled resonators, said transmission paths being collateral paths, and the resonance frequency of the resonators lying on said transmission path being different from the resonance frequency of the resonators lying on said further transmission path; said paths being arranged substantially along level lines of said wafer.
Claim 8
Dependent Claim
107 words
Electro-mechanical filter comprising: a piezoelectric wafer having two large faces disposed obliquely in relation to one another, two pairs of mutually opposite electrodes arranged on said faces along a transmisson path for building up two coupled resonators, and at least two further pairs of mutually opposite electrodes arranged on said faces along a further transmission path for building up two further coupled resonators, said transmission paths being collateral paths, and the resonance frequency of the resonators lying on said transmission path being different from the resonance frequency of the resonators lying on said further transmission path; said paths being arranged substantially along level lines of said wafer.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |