US4707631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isotropic acoustic wave substrate
Assignee: Northrop Grumman Corp
•
Filing: 1986-07-17
•
Granted: 1987-11-17
•
Expires: 2006-07-17
Abstract
Abstract A surface acoustic wave (SAW) diffraction-effect or interference-effect device with a highly isotropic substrate having a high coupling coefficient and low attenuation losses. The use of X-propagating rotated-Y-cut lithium niobate as the SAW substrate, with the Y rotation angle selected at 121 degrees, provides a practically isotropic material, with a high coupling coefficient and relatively low attenuation losses.
Inventors
- 👤 Robert B. Stokes
- 👤 Kuo-Hsiung Yen
- 👤 Kei-Fung Lau
- 👤 Reynold S. Kagiwada
- 👤 Michael J. Delaney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:45
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/125; H03H9/145; H03H9/14544; H03H9/1455; H03H3/00; H03H3/007; H03H3/08; H03H9/02535; H03H9/02543; H03H9/02559
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
For use in a two-dimensional diffraction-effect or interference-effect surface acoustic wave (SAW) device, a structure comprising: a substantially isotropic SAW substrate of X-propagating rotated Y-cut lithium niobate (LiNbO 3 ) having a Y rotation angle of approximately 121 degrees; and a plurality of electro-acoustic transducers disposed on a surface of said substrate at substantially different angles relative to the principal X propagating direction, thereby directly exploiting the diffraction or interference properties of acoustic waves.
Claim 2
Dependent Claim
74 words
For use in a two-dimensional diffraction-effect or interference-effect surface acoustic wave (SAW) device, a structure comprising: a substantially isotropic SAW substrate of X-propagating rotated Y-cut lithium niobate (LiNbO 3 ) having a Y rotation angle of approximately 121 degrees; and a plurality of electro-acoustic transducers disposed on a surface of said substrate at substantially different angles relative to the principal X propagating direction, thereby directly exploiting the diffraction or interference properties of acoustic waves.
References Cited (Backward Citations)
US3919669A
Cited
US4063198A
Cited
US4019074A
Cited
US4066984A
Cited
US4049982A
Cited
US4126800A
Cited
US4159435A
Cited
US4203082A
Cited
US4409571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-16 | 1991-05-18 | 1991-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-16 | 1995-05-18 | 1995-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-16 | 1999-05-18 | 1999-11-17 | $7700.00 | Window Closed / Lapsed |