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:
Nov. 24, 1992
Filed:
Mar. 08, 1990
Shou-Mean Fang, Union City, CA (US);
David A Horsma, Palo Alto, CA (US);
Guillaume Peronnet, Palo Alto, CA (US);
Charles H Camphouse, Mountain View, CA (US);
Raychem Corporation, Manlo Park, CA (US);
Abstract
Circuit protection systems which comprise a PTC resistor and a second resistor, e.g. a thick film resistor, which is thermally and electrically connected to the PTC resistor have a break current I.sub.B and a hold current I.sub.H such that the ratio I.sub.B /I.sub.H is at most 20. Suitable PTC resistors are conductive polymer devices which comprise a PTC element which has been radiation crosslinked under conditions such that the average dose rate is at most 3.0 Mrad/minute or during which no part of the PTC element which is in contact with the electrodes reaches a temperature greater than (T.sub.m -60).degree.C., where T.sub.m is the melting point of the polymeric component of the conductive polymer.