US3873947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple frequency flexure-mode resonator
Assignee: Boeing North American Inc
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Filing: 1974-04-22
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Granted: 1975-03-25
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Expires: 1994-04-22
Abstract
Abstract A flexure-mode resonator employs a plurality of switchable piezoelectric transducers which can be shorted out individually or in combination to provide multiple operating frequencies.
Inventors
- 👤 Robert A Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:09
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/24; H03H9/46; H03H9/48; H03H9/50
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
72 words
A multiple frequency flexure-mode resonator comprising: a metal bar having an electrode termination connected thereto, a plurality of piezoelectric transducers affixed to said bar along its length with each transducer having a metallically coated surface area with an electrode termination connected thereto and means for selectively shorting out said transducers individually or in combination by connecting the metal bar electrode termination to the electrode terminations of the transducers to be shorted out.
Claim 2
Dependent Claim
72 words
A multiple frequency flexure-mode resonator comprising: a metal bar having an electrode termination connected thereto, a plurality of piezoelectric transducers affixed to said bar along its length with each transducer having a metallically coated surface area with an electrode termination connected thereto and means for selectively shorting out said transducers individually or in combination by connecting the metal bar electrode termination to the electrode terminations of the transducers to be shorted out.
Claim 3
Dependent Claim
37 words
The resonator of claim 1 wherein said transducers are formed from a single piece of piezoelectric material and the separation between the metallically coated surface areas thereof is sufficient to essentially avoid electrical coupling between adjacent transducers.
Claim 4
Dependent Claim
12 words
The resonator of claim 1 wherein said bar has a rectangular shape.
Claim 5
Dependent Claim
53 words
The resonator of claim 1 wherein its resonant frequency is reduced by an amount Delta f for each transducer which is shorted out and Delta f equals k2f/2, where f equals the resonant frequency of the resonator and k equals the electromechanical coupling coefficient for the transducer which is to be shorted out.
Claim 6
Dependent Claim
19 words
The resonator of claim 1 wherein one of said transducers is provided solely for connection to an external circuit.
Claim 7
Dependent Claim
22 words
The resonator of claim 1 wherein two of said transducers are provided solely for connection to external input and output circUits respectively.
References Cited (Backward Citations)
US3576453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |