US3949246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric bimorph controlled variable capacitor
Assignee: United States Department of the Army
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Filing: 1974-12-23
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Granted: 1976-04-06
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Expires: 1994-12-23
Abstract
Abstract This invention relates to a remotely controlled variable capacitor, more ticularly, to an electromechanical capacitor with one of the capacitor electrodes mounted on one surface of a bimorph element and the other capacitor electrode mounted on the surface of a superimposed bimorph element. In response to a DC electrical signal, there is a mechanical motion separating the capacitor electrodes to vary the capacitance therebetween.
Inventors
- 👤 Dieter R. Lohrmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:08
CPC Classifications
H; H01; H01G; H01G5/00; H01G5/16; H10; H10N; H10N30/00; H10N30/20; H10N30/204
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
166 words
A variable capacitor comprising: first and second disc-shaped bimorph elements, each having opposed parallel surfaces; each said bimorph element having a capacitor electrode mounted on one of said surface; each said capacitor electrode including a broad section mounted at the center of said one surface and a narrow section extending from said broad section to the periphery of said one surface; each said bimorph element having a conductor mounted on and extending over said one surface in the same plane as said capacitor electrode and spaced from said capacitor electrode; a conductor mounted on and extending over the other of said surface of each said bimorph element; mounting means for connecting the periphery of said bimorph elements to each other with each said one surface superimposed and adjacent; means for insulating said capacitor electrodes from each other; and each said bimorph element being polarized in a direction such that a voltage will cause said bimorph elements to flex away from each other at the centers thereof.
Claim 2
Dependent Claim
166 words
A variable capacitor comprising: first and second disc-shaped bimorph elements, each having opposed parallel surfaces; each said bimorph element having a capacitor electrode mounted on one of said surface; each said capacitor electrode including a broad section mounted at the center of said one surface and a narrow section extending from said broad section to the periphery of said one surface; each said bimorph element having a conductor mounted on and extending over said one surface in the same plane as said capacitor electrode and spaced from said capacitor electrode; a conductor mounted on and extending over the other of said surface of each said bimorph element; mounting means for connecting the periphery of said bimorph elements to each other with each said one surface superimposed and adjacent; means for insulating said capacitor electrodes from each other; and each said bimorph element being polarized in a direction such that a voltage will cause said bimorph elements to flex away from each other at the centers thereof.
Claim 3
Dependent Claim
21 words
A variable capacitor as in claim 1 and wherein said first and second bimorph elements are mounted in a high vacuum.
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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |