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:
Nov. 30, 1976
Filed:
Dec. 03, 1975
Applicant:
Inventor:
Robert H Insley, Royal Oak, MI (US);
Assignee:
Champion Spark Plug Company, Toledo, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01T / ;
U.S. Cl.
CPC ...
3131 / ; 29 2512 ; 313136 ;
Abstract
An improved semiconductor and semiconductor coating for alumina electrical insulating devices is disclosed. The semiconductor is prepared by applying a layer of a mixture of monoxide and sesquioxide combination to an alumina body and firing at a temperature of 2300.degree. or above thereby forming a stable spinel. The electrically-conductive monoxide can be FeO, Cu.sub.2 O, CuO, NiO, CoO or MnO. The sesquioxide can be Fe.sub.2 O.sub.3, Cr.sub.2 O.sub.3, Ga.sub.2 O.sub.3, Ca.sub.2 O.sub.3, Mn.sub.2 O.sub.3, Al.sub.2 O.sub.3 or Ti.sub.2 O.sub.3.