US4634913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Application of lithium tetraborate to electronic devices
Assignee: Marconi Caswell Ltd
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Filing: 1985-02-21
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Granted: 1987-01-06
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Expires: 2005-02-21
Abstract
Abstract An electronic device, such as a Surface Wave, Bulk Wave or pyroelectric device, exploiting the polar nature of an active material in which the active material is lithium tetraborate or a closely related compound for example one which is slightly deficient in Lithium or Boron e.g. (Li2-/+ delta 1)B4O7 or Li2(B4-/+ delta 2)O7 where delta 1 and delta 2 are small numbers.
Inventors
- 👤 Roger W. Whatmore
- 👤 Iain M. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:24
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/36; H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/853; H10N30/8542
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
30 words
A piezo-electric device comprising a body of piezoelectric active material and electrodes adjacent to and in contact with said body, wherein said body is of single crystal lithium tetraborate material.
Claim 2
Dependent Claim
30 words
A piezo-electric device comprising a body of piezoelectric active material and electrodes adjacent to and in contact with said body, wherein said body is of single crystal lithium tetraborate material.
Claim 3
Dependent Claim
60 words
A device as claimed in claim 1, a surface acoustic wave device comprising a substrate body of piezo-electric active material; an input transducer electrode; and, an output transducer electrode; both electrodes being located apart on a major surface of said substrate, wherein, the substrate is of X-cut lithium tetraborate crystal and the electrodes are spaced apart in the Z-propagation direction.
Claim 4
Dependent Claim
21 words
A device, substantially as claimed in claim 2, but wherein the crystal cut is offset from but close to said X-cut.
Claim 5
Dependent Claim
23 words
A device, substantially as claimed in claim 2, but wherein the transducer electrodes are arranged offset from but close to said Z-propagation direction.
Claim 6
Dependent Claim
49 words
A device, as claimed in claim 1, a bulk wave device comprising, a plate body of piezo-electric active material; an input electrode; and, an output electrode; each electrode being located adjacent to an opposite major face of said plate; wherein said plate is of Z-cut lithium tetraborate crystal material.
Claim 7
Dependent Claim
20 words
A device, as claimed in claim 5, but wherein said plate is cut offset from but close to said Z-cut.
Claim 8
Dependent Claim
52 words
A device, as claimed in claim 1, a pyroelectric device comprising a plate body of pyro-electric active material, a conducting and absorbing electrode adjacent one major face of the plate and a further electrode adjacent the other major face of the plate, wherein the plate is of Z-cut lithium tetraborate crystal material.
Claim 9
Dependent Claim
20 words
A device, as claimed in claim 7, but wherein the plate is cut offset from but close to said Z-cut.
References Cited (Backward Citations)
US4523119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |