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. 11, 1997
Filed:
Feb. 23, 1995
Yasuhito Yajima, Nagoya, JP;
NGK Insulators, Ltd., Nagoya, JP;
Abstract
A resistor element has a ceramic substrate and a metallic resistor coated onto the substrate. The metallic resistor has varied electrical resistance depending on temperature. A pair of leads are electrically connected to the metallic resistor. A plurality of glass layers having different compositions are coated onto the metallic resistor. The second glass layer fills a hole formed in the first glass layer, thereby improving response of the resistor element. The second glass layer has a softening point lower than the first glass layer, thereby small bubbles remain dispersed in each glass layer without aggregation. An outermost glass layer is composed of a glass resisting chemicals or a glass resisting abrasion. An innermost glass layer is composed of a glass containing up to 3 percent by mole of a sum of Na.sub.2 O and K.sub.2 O.