The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 18, 1983
Filed:
Nov. 13, 1981
Applicant:
Inventors:
Robert L Miller, Urbana, IL (US);
Adrian DeVries, Mount Prospect, IL (US);
Assignee:
Zenith Radio Corporation, Glenview, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03H / ; H03H / ;
U.S. Cl.
CPC ...
3103 / ; 29 2535 ; 333194 ; 333195 ;
Abstract
Electric domain reversals are arranged in parallel arrays on a piezoelectric ceramic substrate to form strong reflectors of surface acoustic waves in devices such as filters, resonators and the like. The domains are prepared by a poling process involving the use of a selective electrode pattern to which a high DC voltage is applied at a temperature above ambient but below the Curie temperature of the substrate.