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:
Jun. 08, 1976
Filed:
Sep. 18, 1974
Applicant:
Inventors:
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01B / ;
U.S. Cl.
CPC ...
252520 ; 252521 ; 106 46 ; 106 7331 ;
Abstract
A PTC thermistor composition containing barium oxide and titanium oxide as a base material, a semiconducting element to make the base material semiconductive and hafnium dioxide, and if necessary, an additive element. Due to the use of hafnium dioxide, the thermistor composition contributes to a large positive temperature coefficient of resistance. This invention also provides a novel method of making the thermistor composition, in which the addition of hafnium is carried out at the step of milling which comes after the step of calcining. By this method, hafnium can be very effectively used.
Matsuoka, Tomizo. (1976). Ptc thermistor composition and method of making the same (U.S. Patent No. 3962146). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/3962146
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