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. 04, 1992
Filed:
Mar. 28, 1989
Applicant:
Inventors:
Assignees:
Nippondenso Co., Ltd., Kariya, JP;
Nippon Soken, Inc., Nishio, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B / ; H05B / ; F02P / ;
U.S. Cl.
CPC ...
219270 ; 1231 / ; 219553 ; 252513 ; 252516 ; 361266 ;
Abstract
An electrically conductive ceramic material containing at least 20 wt % of Mo.sub.5 Si.sub.3 C and having a resistance-temperature coefficient no greater than 5.times.10.sup.-4 deg.sup.-1 is used to make the heating element of a self-controlling type glow plug having a resistor with a larger temperature-resistance coefficient, such as iron or nickel, connected in series to the heating element for controlling the supply of electric current to the heating element. The ceramic material is made by firing a ceramic powder mixture of Mo and Si mixed with carbon black.