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US4617487A
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Piezoelectric elastic surface wave element with film of tantalum pentoxide or silicon nitride
Assignee: Alps Alpine Co Ltd
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Filing: 1985-09-23
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Granted: 1986-10-14
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Expires: 2005-09-23
Abstract
Abstract An elastic surface wave element which has a grille-shaped electrode formed on a piezoelectric substrate is improved by having the grille-shaped electrode portion thereof covered with an insulating film made of tantalum pentoxide or silicon nitride. The insulating film functions to minimize the degradation of properties suffered by the conventional elastic surface wave element and preclude substantially completely the phenomenon of short-circuit between the electrode bars of the grille-shaped electrode.
Inventors
- 👤 Takehiko Sone
- 👤 Takehiro Takoshima
- 👤 Yoshimi Kamijyo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:41
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/05; H03H9/10; H03H9/1064; H03H9/1071; H03H9/02535; H03H9/02818
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
30 words
An elastic surface wave element having a grille-shaped electrode formed on a piezzoelectric substrate, which is characterized by covering said grille-shaped electrode portion with an insulating film of tantalum pentoxide.
Claim 2
Dependent Claim
30 words
An elastic surface wave element having a grille-shaped electrode formed on a piezzoelectric substrate, which is characterized by covering said grille-shaped electrode portion with an insulating film of tantalum pentoxide.
Claim 3
Dependent Claim
30 words
An elastic surface wave element having a grille-shaped electrode formed on a piezzoelectric substrate, which is characterized by covering said grille-shaped electrode portion with an insulating film of silicon nitride.
Claim 4
Dependent Claim
30 words
An elastic surface wave element having a grille-shaped electrode formed on a piezzoelectric substrate, which is characterized by covering said grille-shaped electrode portion with an insulating film of silicon nitride.
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) | 1989-10-13 | 1990-04-14 | 1990-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-13 | 1994-04-14 | 1994-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-13 | 1998-04-14 | 1998-10-14 | $7700.00 | Window Closed / Lapsed |