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:
Jun. 16, 1998
Filed:
Mar. 28, 1997
Applicant:
Inventor:
Christine E Geosling, Calabasas, CA (US);
Assignee:
Litton Systems, Inc., Woodland Hills, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C30B / ;
U.S. Cl.
CPC ...
117-2 ; 117-3 ; 117948 ;
Abstract
A method for poling a ferroelectric crystal includes heating the crystal to a temperature above its Curie temperature and applying a first selected voltage to the electrodes to apply an electric field to the crystal. The temperature of the crystal is then reduced to a temperature below the Curie temperature of the crystal, and a second electric field having polarity opposite to the polarity of the first electric field is applied to the crystal. Application of the second electric field reduces nonuniformity in ion concentration across the crystal.