Patent US1389418A successfully refreshed from Google Patents.
US4943751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface acoustic wave element
Assignee: Faurecia Clarion Electronics Co Ltd
•
Filing: 1989-06-20
•
Granted: 1990-07-24
•
Expires: 2009-06-20
Abstract
Abstract In a surface acoustic wave element comprising a semiconductor substrate, a piezoelectric layer formed thereon and at least one interdigital electrode disposed on the surface thereof, a semiconductor region having a conductivity type different from that of the semiconductor substrate is disposed on the outer side of the interdigital electrode just below the piezoelectric layer.
Inventors
- 👤 Syuichi Mitsutsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:15
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02535; H03H9/0296; H03H9/02976; G; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/195
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
66 words
A surface acoustic wave element comprising: a first conductivity type semiconductor substrate; a piezoelectric layer formed on said semiconductor substrate; at least one interdigital electrode disposed on said piezoelectric layer; and a second conductivity type semiconductor region disposed at a position on the side of the end surface of said substrate, viewed from said interdigital electrode, in the upper surface portion just below said piezoelectric layer.
Claim 2
Dependent Claim
66 words
A surface acoustic wave element comprising: a first conductivity type semiconductor substrate; a piezoelectric layer formed on said semiconductor substrate; at least one interdigital electrode disposed on said piezoelectric layer; and a second conductivity type semiconductor region disposed at a position on the side of the end surface of said substrate, viewed from said interdigital electrode, in the upper surface portion just below said piezoelectric layer.
Claim 3
Dependent Claim
74 words
A surface acoustic wave element comprising: a first conductivity type semiconductor substrate; an insulating layer formed on said semiconductor substrate; a piezoelectric layer formed on said semiconductor substrate; at least one interdigital electrode disposed on said piezoelectric layer; and a second conductivity type semiconductor region disposed at a position on the side of the end surface of said substrate, viewed from said interdigital electrode, in the upper surface portion just below said piezoelectric layer.
Claim 4
Dependent Claim
74 words
A surface acoustic wave element comprising: a first conductivity type semiconductor substrate; an insulating layer formed on said semiconductor substrate; a piezoelectric layer formed on said semiconductor substrate; at least one interdigital electrode disposed on said piezoelectric layer; and a second conductivity type semiconductor region disposed at a position on the side of the end surface of said substrate, viewed from said interdigital electrode, in the upper surface portion just below said piezoelectric layer.
Claim 5
Dependent Claim
20 words
A surface acoustic wave element according to claim 1 wherein said semiconductor substrate has a semiconductor/high impurity concentration semiconductor structure.
Claim 6
Dependent Claim
39 words
A surface acoustic wave element according to claim 1 or 2 wherein the mode of the surface acoustic wave is Sezawa wave; the semiconductor is Si; the face orientation of Si is (110); and the propagation direction is [100].
Claim 7
Dependent Claim
39 words
A surface acoustic wave element according to claim 1 or 2 wherein the mode of the surface acoustic wave is Sezawa wave; the semiconductor is Si; the face orientation of Si is (100); and the propagation direction is [110].
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) | 1993-07-23 | 1994-01-22 | 1994-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-23 | 1998-01-22 | 1998-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-23 | 2002-01-22 | 2002-07-24 | $7700.00 | Window Closed / Lapsed |