US3678304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic wave device for converting bulk mode waves to surface waves and vice versa
Assignee: Individual
•
Filing: 1971-01-12
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Granted: 1972-07-18
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Expires: 1991-01-12
Abstract
Abstract An acoustic wave device comprising a body of material having two generally plane, parallel surfaces facing each other, means for launching a bulk acoustic standing wave system in the body between the two surfaces or for detecting such a standing wave system, at least one of the two surfaces having a shaped profile arranged to launch a wave having a component consisting of an interface wave on the boundary of the body and being derived from energy trapped in the said bulk standing wave system or to receive an interface wave developed on the boundary of the body and to convert at least part of it into a bulk standing wave.
Inventors
- 👤 Reginald Frederick Humphryes
- 👤 Iain Mclaren Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:00
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/15; H03H9/17; G; G02; G02B; G02B27/00; G02B27/42; G02B27/4233; H04; H04R; H04R17/00; H04R17/04; H04R17/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
140 words
An acoustic wave device comprising a body of piezo-electric material carrying a pair of contacts on opposite faces of the body adapted to produce a bulk acoustic standing wave system in the body, said opposite faces being spaced apart by a distance such as to produce a resonant structure corresponding to an odd multiple of a bulk acoustic wave half wavelength, at least one surface of the body having a shaped profile arranged to launch a wave having at least a component consisting of an interface wave on a boundary of the body and being derived from energy trapped in the said bulk standing wave system, said shaped profile comprising a plurality of grooves in said surface, said grooves having triangular cross sections and being placed parallel to one another and perpendicular to the direction of propagation of interface waves.
Claim 2
Dependent Claim
140 words
An acoustic wave device comprising a body of piezo-electric material carrying a pair of contacts on opposite faces of the body adapted to produce a bulk acoustic standing wave system in the body, said opposite faces being spaced apart by a distance such as to produce a resonant structure corresponding to an odd multiple of a bulk acoustic wave half wavelength, at least one surface of the body having a shaped profile arranged to launch a wave having at least a component consisting of an interface wave on a boundary of the body and being derived from energy trapped in the said bulk standing wave system, said shaped profile comprising a plurality of grooves in said surface, said grooves having triangular cross sections and being placed parallel to one another and perpendicular to the direction of propagation of interface waves.
Claim 3
Dependent Claim
92 words
An acoustic wave device comprising a body of material capable of supporting acoustic waves and carrying a pair of contacts on opposite faces of said body spaced apart by a distance such as to produce a resonant structure corresponding to an odd multiple of a bulk acoustic wave half wavelength, at least one surface of said body having a shaped profile arranged to launch a wave having at least a component consisting of an interface wave on a boundary of said body and being derived from energy trapped in said resonant structure.
Claim 4
Dependent Claim
92 words
An acoustic wave device comprising a body of material capable of supporting acoustic waves and carrying a pair of contacts on opposite faces of said body spaced apart by a distance such as to produce a resonant structure corresponding to an odd multiple of a bulk acoustic wave half wavelength, at least one surface of said body having a shaped profile arranged to launch a wave having at least a component consisting of an interface wave on a boundary of said body and being derived from energy trapped in said resonant structure.
Claim 5
Dependent Claim
29 words
An acoustic wave device as in claim 2 in which said shaped profile comprises a plurality of perturbations in the surface repeated regularly at intervals of one interface wavelength.
Claim 6
Dependent Claim
18 words
An acoustic wave device as in claim 3 in which each of said perturbations is asymmetric in cross-section.
Claim 7
Dependent Claim
43 words
An acoustic wave device as in claim 4 in which said perturbations consist of grooves in said surface of said body, said grooves having triangular cross-sections and being placed parallel to one another and perpendicular to the direction of propagation of interface waves.
Claim 8
Dependent Claim
101 words
An acoustic wave device comprising a body of material capable of supporting acoustic waves and carrying a pair of contacts on opposite faces of said body spaced apart by a distance such as to produce a resonant structure corresponding to an odd multiple of a bulk acoustic wave half wavelength, at least one surface of said body having a shaped profile arranged to receive a wave having at least a component consisting of an interface wave on a boundary of said body and operative to convert at least part of said wave into a bulk standing wave in said resonant structure.
Claim 9
Dependent Claim
101 words
An acoustic wave device comprising a body of material capable of supporting acoustic waves and carrying a pair of contacts on opposite faces of said body spaced apart by a distance such as to produce a resonant structure corresponding to an odd multiple of a bulk acoustic wave half wavelength, at least one surface of said body having a shaped profile arranged to receive a wave having at least a component consisting of an interface wave on a boundary of said body and operative to convert at least part of said wave into a bulk standing wave in said resonant structure.
Claim 10
Dependent Claim
29 words
An acoustic wave device as in claim 6 in which said shaped profile comprises a plurality of perturbations in the surface repeated regularly at intervals of one interface wavelength.
Claim 11
Dependent Claim
18 words
An acoustic wave device as in claim 7 in which each of said perturbations is asymmetric in cross-section.
Claim 12
Dependent Claim
43 words
An acoustic wave device as in claim 8 in which said perturbations consist of grooves in said surface of said body, said grooves having triangular cross-sections and being placed parallel to one another and perpendicular to the direction of propagation of interface waves.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |