Piezoelectric crystal element
US5440188A · kind A · utility
8Cited by
8References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1994 |
| Grant date | Aug 8, 1995 |
| Priority date | — |
| Expiry date | Jul 15, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/02574
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A piezoelectric crystal element for surface acoustic wave applications with a quartz substrate with at least one substantially planar quartz surface, the planar quartz surface having an epitaxially grown layer of a quartz-isomorphous crystal with the total molecular formula ABO.sub.4, A standing for Al or Ga, and B for P or As, and the quartz surface and the epitaxial layer having approximately the same crystallographic orientation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.