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:
Jan. 12, 1999
Filed:
Jan. 15, 1997
Applicant:
Inventors:
Felix Greuter, Baden, CH;
Ralf Strumpler, Baden, CH;
Assignee:
ABB Research Ltd., Zurich, CH;
Primary Examiner:
Int. Cl.
CPC ...
B32B / ; H01C / ; H01C / ; H01C / ;
U.S. Cl.
CPC ...
428404 ; 428325 ; 428328 ; 428331 ; 428402 ; 428901 ; 428913 ; 338-7 ; 338 14 ; 338 20 ; 338 21 ; 338 / ; 338223 ; 338224 ; 327512 ;
Abstract
A varistor and a PTC resistor formed from a composite material containing a polymer matrix and a filler. The varistor experiences two nonlinear changes caused by the current due to applied voltage, the varistor comprising a composite material comprising a filler and a polymer matrix, the filler consisting of particles of grained microstructure. The PTC resistor experiences a first nonlinear dependency of resistivity at a first PTC temperature resulting from an interaction of the filler and the polymer matrix and a second nonlinear dependency of resistivity at a second, lower PTC temperature resulting from the filler.