US4484098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Environmentally stable lithium niobate acoustic wave devices
Assignee: RTX Corp
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Filing: 1983-12-19
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Granted: 1984-11-20
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Expires: 2003-12-19
Abstract
Abstract Acoustic Wave Devices comprise lithium niobate substrates 6, 22 having the principal plane cut at zero degrees and 128°, respectively, with respect to the Y crystallographic axis thereof, propagating in the X direction, with amorphous silicon dioxide surface layers of 0.42 and 1.24 wavelengths, respectively.
Inventors
- 👤 Donald E. Cullen
- 👤 Thomas W. Grudkowski
- 👤 Gerald Meltz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:26
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/0222
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
72 words
An acoustic wave device, comprising: a lithium niobate substrate having a principal plane cut at an angle of zero degrees with respect to its Y crystallographic axis with propagation in the X direction; electroacoustic transducer metallization disposed on said surface; and a surface layer of amorphous silicon dioxide disposed on said surface and over said metallization, said layer having a thickness of substantially 0.42 wavelengths of the acoustic wave in said device.
Claim 2
Dependent Claim
72 words
An acoustic wave device, comprising: a lithium niobate substrate having a principal plane cut at an angle of zero degrees with respect to its Y crystallographic axis with propagation in the X direction; electroacoustic transducer metallization disposed on said surface; and a surface layer of amorphous silicon dioxide disposed on said surface and over said metallization, said layer having a thickness of substantially 0.42 wavelengths of the acoustic wave in said device.
Claim 3
Dependent Claim
73 words
An acoustic wave device, comprising: a lithium niobate substrate having a principal plane cut at at an angle of 128 degrees with respect to its Y crystallographic axis with propagation in the X direction; electroacoustic transducer metallization disposed on said surface; and a surface layer of amorphous silicon dioxide disposed on said surface and over said metallization, said layer having a thickness of substantially 1.24 wavelengths of the acoustic wave in said device.
Claim 4
Dependent Claim
73 words
An acoustic wave device, comprising: a lithium niobate substrate having a principal plane cut at at an angle of 128 degrees with respect to its Y crystallographic axis with propagation in the X direction; electroacoustic transducer metallization disposed on said surface; and a surface layer of amorphous silicon dioxide disposed on said surface and over said metallization, said layer having a thickness of substantially 1.24 wavelengths of the acoustic wave in said device.
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) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |