US4328472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic guided wave devices
Assignee: RTX Corp
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Filing: 1980-11-03
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Granted: 1982-05-04
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Expires: 2000-11-03
Abstract
Abstract An acoustic guided wave device has a wave guiding volume (20) which may include transducer elements (22-25) and other metal elements (26), sandwiched between two acoustic half spaces (10, 12) having acoustic velocity faster than the effective acoustic velocity of the material within the wave guiding volume.
Inventors
- 👤 Thomas W. Grudkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:51
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02535; H03H9/02637; H03H9/02779; H03H9/02787
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
105 words
An acoustic wave device including piezoelectric material and electrically conductive transducer elements disposed in proximity therewith to provide acoustoelectric coupling with said device, characterized by an acoustic wave guiding volume having a thickness which is at least a significant fraction of a wavelength of an acoustic wave in said device, said wave guiding volume being disposed between two acoustic wave half spaces, each of said half spaces comprising material having an acoustic velocity which is faster than the effective acoustic velocity of the material within said wave guiding volume, said piezoelectric material and transducer elements disposed to provide acoustoelectric coupling with said wave guiding volume.
Claim 2
Dependent Claim
105 words
An acoustic wave device including piezoelectric material and electrically conductive transducer elements disposed in proximity therewith to provide acoustoelectric coupling with said device, characterized by an acoustic wave guiding volume having a thickness which is at least a significant fraction of a wavelength of an acoustic wave in said device, said wave guiding volume being disposed between two acoustic wave half spaces, each of said half spaces comprising material having an acoustic velocity which is faster than the effective acoustic velocity of the material within said wave guiding volume, said piezoelectric material and transducer elements disposed to provide acoustoelectric coupling with said wave guiding volume.
Claim 3
Dependent Claim
25 words
An acoustic wave device according to claim 1 further characterized by said transducer elements and said piezoelectric material being disposed within said wave guiding volume.
Claim 4
Dependent Claim
36 words
An acoustic wave device according to claim 2 further characterized by one of said acoustic wave half spaces comprising piezoelectric material, said wave guiding volume comprising said transducer elements and material of said one half space.
Claim 5
Dependent Claim
27 words
An acoustic wave device according to claim 1 further characterized by said wave guiding volume including at least one electrically conductive element other than said transducer elements.
Claim 6
Dependent Claim
17 words
An acoustic wave device according to claim 1 further characterized by said wave guiding volume including metal.
Claim 7
Dependent Claim
28 words
An acoustic wave device according to claim 1 further characterized by said wave guiding volume including metal selected from the group consisting of gold, silver, platinum and tungsten.
Claim 8
Dependent Claim
23 words
An acoustic wave device according to claim 1 further characterized by one of said acoustic wave half spaces comprising an electrically insulating material.
Claim 9
Dependent Claim
22 words
An acoustic wave device according to claim 1 further characterized by one of said acoustic wave half spaces comprising a piezoelectric material.
Claim 10
Dependent Claim
38 words
An acoustic wave device according to claim 1 further characterized by said acoustic wave half spaces including material selected from the group consisting of silicon dioxide, zinc oxide, aluminum nitride, aluminum oxide, lithium niobate, gallium arsenide, and silicon.
Claim 11
Dependent Claim
25 words
An acoustic wave device according to claim 1 further characterized by said wave guiding volume having a thickness which is less than one acoustic wavelength.
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) | 1985-05-03 | 1985-11-02 | 1986-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-03 | 1989-11-02 | 1990-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-03 | 1993-11-02 | 1994-05-04 | $7700.00 | Window Closed / Lapsed |