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:
Mar. 30, 1976
Filed:
Sep. 23, 1974
Joseph Nemeth, St. Clair Shores, MI (US);
Champion Spark Plug Company, Toledo, OH (US);
Abstract
An improved ceramic article useful after firing as an electrical suppressor element especially suitable for use in spark plugs is disclosed. The suppressor element is an aluminum-manganese oxide composition modified with a strontium compound which optionally may contain a nickel compound. The numerical value of the atom ratio of the article ##EQU1## IS CONTROLLED FROM 0.1 TO 1.5. The strontium/aluminum atom ratio has a value of from 0.5:1 to 0.95:1. The manganese constitutes from 50 percent to 100 percent based upon the total atoms of manganese and nickel present. The temperature coefficient of resistance of the suppressor, defined by ##EQU2## is between about -2.8%/.degree.C and -1.3%/.degree.C.