Patent US3987377A successfully refreshed from Google Patents.
US3987377A
Expired / Lapsed
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Elastic surface wave propagation device
Assignee: NTT Inc
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Filing: 1975-02-05
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Granted: 1976-10-19
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Expires: 1995-02-05
Abstract
Abstract An elastic surface wave propagation device is disclosed which is composed of a substrate for elastic surface wave propagation and at least one transducer disposed on the major surface of the substrate for converting an electric signal into an elastic surface wave or vice versa. The substrate is formed of quartz crystal and the major surface of the substrate is 43° rotated Y cut plane of the quartz crystal. The angle between the direction of propagation of the elastic surface wave and the X-axis direction of the quartz crystal is selected to be in the range of 8° to 12° so that spurious components are sufficiently suppressed or negligible.
Inventors
- 👤 Kenichi Kuroda
- 👤 Fujio Ishihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:59
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02535; H03H9/02543; H03H9/02551; H03H9/02818; H03H9/30; H03H9/42
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
An elastic surface wave propagation device comprising a substrate for elastic surface wave propagation, and at least one transducer disposed on the flat major surface of said substrate for converting an electric signal into an elastic surface wave or vice versa, in which the substrate is formed of quartz crystal; the major surface of the substrate is a 43° rotated Y cut plane of said quartz crystal; and the angle between the direction of propagation of the elastic surface wave and the X-axis of the quartz crystal is in the range of 8° to 12°.
Claim 2
Dependent Claim
95 words
An elastic surface wave propagation device comprising a substrate for elastic surface wave propagation, and at least one transducer disposed on the flat major surface of said substrate for converting an electric signal into an elastic surface wave or vice versa, in which the substrate is formed of quartz crystal; the major surface of the substrate is a 43° rotated Y cut plane of said quartz crystal; and the angle between the direction of propagation of the elastic surface wave and the X-axis of the quartz crystal is in the range of 8° to 12°.
Claim 3
Dependent Claim
33 words
An elastic surface wave propagation device according to claim 1 wherein the transducer is composed of electrodes of interdigital conductor structure disposed on the 43° rotated Y cut plane of the quartz crystal.
Claim 4
Dependent Claim
128 words
An elastic surface wave propagation device comprising a substrate for elastic surface wave propagation, a transmitting transducer disposed on the flat major surface of said substrate for converting an electric signal into an elastic surface wave, and a receiving transducer disposed opposite to said transmitting transducer on the major surface of the substrate for converting the elastic surface wave into an electric signal, in which the substrate is formed of quartz crystal; the major surface of said substrate is a 43° rotated Y cut plane of said quartz crystal; and the angle between the direction of propagation of the elastic surface wave, that is, the direction joining the transmitting and receiving transducers, and the X-axis direction of the quartz crystal is in the range of 8° to 12°.
Claim 5
Dependent Claim
128 words
An elastic surface wave propagation device comprising a substrate for elastic surface wave propagation, a transmitting transducer disposed on the flat major surface of said substrate for converting an electric signal into an elastic surface wave, and a receiving transducer disposed opposite to said transmitting transducer on the major surface of the substrate for converting the elastic surface wave into an electric signal, in which the substrate is formed of quartz crystal; the major surface of said substrate is a 43° rotated Y cut plane of said quartz crystal; and the angle between the direction of propagation of the elastic surface wave, that is, the direction joining the transmitting and receiving transducers, and the X-axis direction of the quartz crystal is in the range of 8° to 12°.
Claim 6
Dependent Claim
37 words
An elastic surface wave propagation device according to claim 3 wherein the transmitting and receiving transducers are each composed of electrodes of interdigital conductor structure disposed on the 43° rotated Y cut plane of the quartz crystal.
References Cited (Backward Citations)
US3818382A
Cited
US3873946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |