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:
Feb. 21, 1978
Filed:
Mar. 23, 1976
Applicant:
Inventors:
Hideaki Yagi, Kasugai, JA;
Tetsuo Hishiki, Nagoya, JA;
Assignee:
NGK Spark Plug Co. Ltd., Nagoya, JA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01H / ;
U.S. Cl.
CPC ...
200315 ; 313509 ; 337 79 ;
Abstract
Electroluminescent elements comprising a ferroelectric sintered ceramic body as a substrate, a luminescent layer applied on the body, a transparent electrode layer applied on the luminescent layer and an electrode layer applied on other side of the body and having improved withstand voltage properties. The electroluminescent elements are suitable for the indication of location of switch members or the like at the switching-off condition.