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. 27, 1993
Filed:
Oct. 01, 1990
Robert C Srubas, Granby, CT (US);
William M Rowe, Jr, DeKalb, MS (US);
Specialty Cable Corp., Wallingford, CT (US);
Abstract
A coaxial-type heater cable is described for significantly reducing both electromagnetic and electrostatic field while maintaining a flexible heater cable structure by enclosing coaxial arranged inner and outer conductors with a conductive polymer layer that is in electrical contract with the outer conductor. The outer conductor is helically wrapped around the inner conductor with the number of turns per unit length selected to significantly reduce the electromagnetic field emanating from the heater cable while the conductive polymer layer significantly attenuates any electrostatic field that would otherwise fringe through spaces between successive turns of the outer conductor. The heater cable can be of the self-regulating type using a PTC material in electrical contact with and between the inner and outer conductors.