US4247835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface acoustic wave devices
Assignee: UK Secretary of State for Defence
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Filing: 1979-05-24
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Granted: 1981-01-27
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Expires: 1999-05-24
Abstract
Abstract A surface acoustic wave device comprises a quartz substrate having a flat surface carrying one or more transducers for launching and receiving surface acoustic waves along a track in the flat surface. In this invention the flat surface lies in a plane rotated about a Y axis by plus or minus 41° to 47° from the Z plane and the track is aligned 61° to 67° from the Y axis.
Inventors
- 👤 Meiron F. Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:43
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02535; H03H9/02543; H03H9/02551; G; G10; G10K; G10K11/00; G10K11/36
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
A surface acoustic wave device comprising a quartz substrate having a flat surface, and transducer means for launching and receiving acoustic waves along a track in the flat surface wherein the improvement comprises a flat surface which is in a crystalline plane rotated about a Y axis by a value in the range, plus 41° to 47° inclusive and minus 41° to 47° inclusive from the Z plane, and the track is aligned in the range 61° to 67° inclusive from the Y axis, the sense of this alginment being such that the track is approximately perpendicular to a minor rhombohedral crystalline face of the quartz substrate.
Claim 2
Dependent Claim
107 words
A surface acoustic wave device comprising a quartz substrate having a flat surface, and transducer means for launching and receiving acoustic waves along a track in the flat surface wherein the improvement comprises a flat surface which is in a crystalline plane rotated about a Y axis by a value in the range, plus 41° to 47° inclusive and minus 41° to 47° inclusive from the Z plane, and the track is aligned in the range 61° to 67° inclusive from the Y axis, the sense of this alginment being such that the track is approximately perpendicular to a minor rhombohedral crystalline face of the quartz substrate.
Claim 3
Dependent Claim
14 words
A device according to claim 1 wherein the range is 44° to 47° inclusive.
Claim 4
Dependent Claim
17 words
A device according to claim 1 wherein the alignment is in the range 63° to 65° inclusive.
Claim 5
Dependent Claim
22 words
A device according to claim 1 wherein the transducer means comprises at least two interdigital comb transducers spaced apart along the track.
Claim 6
Dependent Claim
17 words
A device according to claim 1 and further comprising reflecting arrays at both ends of the track.
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) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |