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:
Apr. 24, 2001
Filed:
Jul. 13, 1981
Applicant:
Inventor:
Peter H. van Konynenburg, Palo Alto, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01B 1/24 ; C08K 3/04 ;
U.S. Cl.
CPC ...
H01B 1/24 ; C08K 3/04 ;
Abstract
Electrical devices which comprise a PTC element composed of a PTC conductive polymer composition and a contiguous CW element composed of a conductive polymer composition which comprises an organic thermoplastic polymer and a conductive carbon black having a particle size (D) in millimicrons and surface area (S) in m,/g such that S/D is at least 10. D is preferably less than 27 millimicrons, especially less than 18 millicrons. S/D is preferably at least 12, especially at least 18. Particularly useful devices are in the form of heaters.