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. 05, 1985
Filed:
Nov. 07, 1983
Applicant:
Inventors:
Shinichi Yokoi, Aichi, JP;
Tsuneo Ito, Aichi, JP;
Assignee:
NGK Spark Plug Co., Ltd., Aichi, JP;
Primary Examiner:
Int. Cl.
CPC ...
F02B / ; F02P / ;
U.S. Cl.
CPC ...
1231 / ; 219270 ; 219544 ; 219553 ; 361266 ;
Abstract
A ceramic heater including a ceramic insulator having a circular cross section, and a heating coil having an oval cross section, embedded in the insulator along the length thereof, and bent in a U-shaped form with the bend adjacent one end of the insulator. One of a pair of parallel coil portions defining the U-shaped coil has a long cross sectional diameter lying parallel to that of the other coil portion. The diameter of a cylinder defined by the outer surfaces of the coil portions and the outside diameter of the insulator have a ratio of 35:100 to 70:100.