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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.:

US 10014097 B1

PDFFull Text
Date of Patent:
Jul. 03, 2018

Filed:

Jul. 28, 2016

Semiconductor ceramic composition and ptc thermistor

Applicant:

Tdk Corporation, Tokyo, JP;

Inventors:

Kazutaka Fujita, Tokyo, JP;

Kazuhiko Itoh, Tokyo, JP;

Yoshikazu Shimura, Tokyo, JP;

Assignee:

TDK CORPORATION, Tokyo, JP;

Attorney:

Oliff PLC

Primary Examiner:

Kyung Lee

Assistant Examiner:

Iman Malakooti

Int. Cl.
CPC ...
H01C 7/02 (2006.01); C04B 35/468 (2006.01); C04B 35/626 (2006.01); C04B 35/64 (2006.01); H01C 1/14 (2006.01);
U.S. Cl.
CPC ...
H01C 7/027 (2013.01); C04B 35/4682 (2013.01); C04B 35/6261 (2013.01); C04B 35/6263 (2013.01); C04B 35/62625 (2013.01); C04B 35/62645 (2013.01); C04B 35/64 (2013.01); H01C 1/1406 (2013.01); H01C 7/025 (2013.01); C04B 2235/3201 (2013.01); C04B 2235/3208 (2013.01); C04B 2235/3225 (2013.01); C04B 2235/3227 (2013.01); C04B 2235/3229 (2013.01); C04B 2235/3234 (2013.01); C04B 2235/3239 (2013.01); C04B 2235/3251 (2013.01); C04B 2235/3253 (2013.01); C04B 2235/3255 (2013.01); C04B 2235/3262 (2013.01); C04B 2235/3298 (2013.01); C04B 2235/3418 (2013.01); C04B 2235/602 (2013.01); C04B 2235/606 (2013.01); C04B 2235/658 (2013.01); C04B 2235/6562 (2013.01); C04B 2235/6565 (2013.01); C04B 2235/79 (2013.01); C04B 2235/9607 (2013.01);
Abstract

A semiconductor ceramic composition including a compound represented by the following general formula (1) as a main component.(BaBiARE)(TiTM)O  (1)(wherein, A represents both elements of Na and K; RE is at least one element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Gd, Dy and Er; and TM is at least one element selected from the group consisting of V, Nb and Ta.)0.01≤x≤0.15  (2)x≤y≤0.3  (3)0≤()≤0.01  (4)  (5)  (6)0.950≤m≤1.050  (7)further, 0.001 mol to 0.055 mol of Ca is included and the ratio of Na/(Na+K) is 0.1 or more and less than 1.

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