Patent US3974405A successfully refreshed from Google Patents.
US3974405A
Expired / Lapsed
US
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Piezoelectric resonators
Assignee: Licentia Patent Verwaltungs GmbH
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Filing: 1973-03-12
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Granted: 1976-08-10
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Expires: 1993-03-12
Abstract
Abstract To reduce the capacitive coupling between the input and output transducers of a piezoelectric resonator arrangement having a one-piece construction, one or a plurality of coatings disposed between the two transducers, which coatings serve for defining given resonators, are connected to ground on either one or both sides and, if required, one coating of the input and output transducers is also connected to ground.
Inventors
- 👤 Hans Schussler
- 👤 Gerhard Kohlbacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:56
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/54; H03H9/56; H03H9/02; H03H9/02007; H03H9/02086; H03H9/02125
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
174 words
In a completed piezoelectric resonator arrangement of one-piece construction prepared for connection between a signal source and a load and composed of a plate-shaped vibratory material to which coatings are applied on both sides, a pair of such coatings being applied at each of its input and output ends to define input and output transducers, and pairs of such coatings being applied between such ends to define resonators, with a signal input terminal being connected to one of the coatings of the input transducer and a signal output terminal being connected to one of the coatings of the output transducer, the improvement wherein in order to reduce the capacitive coupling between the input and output transducers, both coatings of at least one resonator are connected to ground, at least one but less than all of the remaining coatings disposed between the input and output transducers, and defining resonators, is connected to ground, and those of the remaining coatings which are not connected to ground are also electrically isolated from said input and output terminals.
Claim 2
Dependent Claim
174 words
In a completed piezoelectric resonator arrangement of one-piece construction prepared for connection between a signal source and a load and composed of a plate-shaped vibratory material to which coatings are applied on both sides, a pair of such coatings being applied at each of its input and output ends to define input and output transducers, and pairs of such coatings being applied between such ends to define resonators, with a signal input terminal being connected to one of the coatings of the input transducer and a signal output terminal being connected to one of the coatings of the output transducer, the improvement wherein in order to reduce the capacitive coupling between the input and output transducers, both coatings of at least one resonator are connected to ground, at least one but less than all of the remaining coatings disposed between the input and output transducers, and defining resonators, is connected to ground, and those of the remaining coatings which are not connected to ground are also electrically isolated from said input and output terminals.
Claim 3
Dependent Claim
19 words
An arrangement as defined in claim 1 wherein the other coating of each transducer is also connected to ground.
Claim 4
Dependent Claim
20 words
Piezoelectric resonator arrangement as defined in claim 2 wherein the coatings which are connected to ground are electrically connected together.
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) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |