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:
Dec. 20, 1994
Filed:
Sep. 15, 1992
Applicant:
Inventors:
Norio Tsubokawa, Niigata, JP;
Naoki Yamazaki, Tokyo, JP;
Assignee:
Daito Communication Apparatus Co., Ltd., Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C08K / ; C08K / ;
U.S. Cl.
CPC ...
252511 ; 252512 ; 524113 ; 524495 ; 524543 ; 524563 ; 522 75 ; 522153 ; 522154 ;
Abstract
A method for making a PTC element grafts a crystalline polymer to conductive particles to form a PTC composition. The step of grafting including solution polymerization. The PTC composition is formed into a PTC element. The PTC element is cross-linked after forming. The PTC element according to this invention exhibits superior PTC behavior when the temperature of the PTC element reaches the crystal melting point of the crystalline polymer.