Patent US3784849A successfully refreshed from Google Patents.
US3784849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Devices incorporating cavity resonators
Assignee: Teledyne UK Ltd
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Filing: 1972-07-28
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Granted: 1974-01-08
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Expires: 1992-07-28
Abstract
Abstract A device incorporating a cavity resonator and in which there is employed a transducer for controlling a conductive member and a further transducer subject to the same strain as the controlling transducer whereby the further transducer produces on an external terminal or lead a low frequency signal representative of the deflection of the controlling transducer.
Inventors
- 👤 B Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:12
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/18; H01J23/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
In a microwave device including a resonant cavity, a piezoelectric transducer arm disposed adjacent said cavity, first terminal means connected to said transducer arm for enabling tuning signals to be applied to cause the transducer arm to flex and a conductive tuning member mounted on said transducer arm and arranged to move in response to the flexing of the transducer arm and thereby change the resonant frequency of the resonant cavity, the combination of deflection responsive means having further terminal means to produce at said further terminal means a low frequency signal representative of the deflection caused by the flexing of said transducer arm.
Claim 2
Dependent Claim
104 words
In a microwave device including a resonant cavity, a piezoelectric transducer arm disposed adjacent said cavity, first terminal means connected to said transducer arm for enabling tuning signals to be applied to cause the transducer arm to flex and a conductive tuning member mounted on said transducer arm and arranged to move in response to the flexing of the transducer arm and thereby change the resonant frequency of the resonant cavity, the combination of deflection responsive means having further terminal means to produce at said further terminal means a low frequency signal representative of the deflection caused by the flexing of said transducer arm.
Claim 3
Dependent Claim
31 words
A device as claimed in claim 1 wherein said deflection responsive means is a piezoelectric transducer mounted so as to be subject to the same strain as said piezoelectric tRansducer arm.
Claim 4
Dependent Claim
74 words
A device as claimed in claim 1 wherein said piezoelectric transducer arm comprises a transducer body of piezoelectric material having opposite first and second faces, first and second electrodes disposed respectively on said opposite faces and respectively connected to first and second terminals constituting said first terminal means there being provided a third electrode disposed on one said opposite faces and electrically connected to said further terminal means for providing said low frequency signal.
Claim 5
Dependent Claim
76 words
A device as claimed in claim 1 wherein said piezoelectric transducer arm comprises first and second piezoelectric transducers arranged substantially parallel to one another and electrically connected in parallel to said first terminal means there being provided a third piezoelectric transducer mounted between said first and second transducers and electrically connected to said further terminal means, said first, second and third transducers being disposed in parallel so as to be subject to the same mechanical deflection.
References Cited (Backward Citations)
US2463472A
Cited
US2841722A
Cited
US3381149A
Cited
US3117189A
Cited
US3478246A
Cited
US3478247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |