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:
Jul. 21, 1992
Filed:
Mar. 28, 1990
Applicant:
Inventor:
Hiroaki Abe, Nagoya, JP;
Assignee:
NGK Insulators, Ltd., Nagoya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C30B / ; C30B / ;
U.S. Cl.
CPC ...
423593 ; 1566171 ; 1566202 ; 1566203 ; 156D / ; 156D / ; 156D / ; 156D / ;
Abstract
Disclosed herein is an optically active single crystal, which has both levo-rotatory portion and dextro-rotatory portion and is even in optical rotatory power and physical constants such as electrooptic constant and Farady constant. Its fabrication process is also disclosed, wherein a single crystal is grown in accordance with the crystal pulling method making use of a seed crystal comprising a levo-rotatory single crystal and a dextro-rotatory single crystal, which are joined to each other. The process permits fabrication of the above-mentioned optically active single crystal in a short period of time and with ease.