US3956646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithium niobate piezoelectric substrate for use in an elastic surface wave device
Assignee: Nihon Dempa Kogyo Co Ltd
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Filing: 1974-12-30
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Granted: 1976-05-11
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Expires: 1994-12-30
Abstract
Abstract A theta -rotated Y-cut X-propagating piezoelectric substrate of crystalline lithium niobate for use in an elastic surface wave device, wherein the angle theta at which the substrate is cut out is chosen to range between 125.6 DEG and 130.1 DEG to suppress spurious wave components.
Inventors
- 👤 Kimio Shibayama
- 👤 Hiroaki Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:59
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02535; H03H9/02543; H03H9/02559; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/853; H10N30/8542
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
68 words
A lithium niobate acoustic surface wave substrate having an acoustic surface wave propagation surface parallel to the lithium niobate crystalline X-axis, the normal of said acoustic surface wave propagation surface intersecting the lithium niobate crystalline Y-axis at an angle θ, the improvement wherein the intersecting angle θ of the normal of said acoustic surface wave propagation surface and the lithium niobate crystalline Y-axis ranges from 125.6° to 130.1°.
Claim 2
Dependent Claim
68 words
A lithium niobate acoustic surface wave substrate having an acoustic surface wave propagation surface parallel to the lithium niobate crystalline X-axis, the normal of said acoustic surface wave propagation surface intersecting the lithium niobate crystalline Y-axis at an angle θ, the improvement wherein the intersecting angle θ of the normal of said acoustic surface wave propagation surface and the lithium niobate crystalline Y-axis ranges from 125.6° to 130.1°.
Claim 3
Dependent Claim
21 words
The lithium niobate acoustic surface wave substrate according to claim 1 wherein said intersecting angle θ ranges from 127.2° to 128.5°.
Claim 4
Dependent Claim
19 words
The lithium niobate acoustic surface wave substrate according to claim 2 wherein said intersecting angle θ is substantially 127.86°.
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) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |