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. 31, 1981
Filed:
May. 10, 1979
Kazuo Ishikawa, Chitose, JP;
Kazuo Hosaka, Chitose, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
A self heat generation type positive characteristic thermistor and a manufacturing method thereof. The thermistor is made of more than three layers of positive characteristic thermistor element bodies, such that the specific resistance of the layer situated nearer the surface in the direction of element thickness perpendicular to electrodes is higher. According to this invention a positive characteristic thermistor which generates heat instantaneously when a large current is flown therethrough and has excellent thermal shock proof properties can be obtained simply. The thermistor is well suited to mass production and the use of the thermistor can be extended to many fields.