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:
Jun. 28, 2016
Filed:
Feb. 02, 2012
Maher I. Boulos, Sherbrooke, CA;
Nicolas Dignard, Sherbrooke, CA;
Alexandre Auger, Sherbrooke, CA;
Jerzy Jurewicz, Sherbrooke, CA;
Sébastien Thellend, Sherbrooke, CA;
Maher I. Boulos, Sherbrooke, CA;
Nicolas Dignard, Sherbrooke, CA;
Alexandre Auger, Sherbrooke, CA;
Jerzy Jurewicz, Sherbrooke, CA;
Sébastien Thellend, Sherbrooke, CA;
Tekna Plasma Systems Inc., Sherbrooke, CA;
Abstract
A plasma confinement tube for use in an induction plasma torch is disclosed. The plasma confinement tube defines a geometrical axis and an outer surface. The plasma confinement tube includes a capacitive shield comprising a film of conductive material applied to the outer surface of the plasma confinement tube and segmented into axial strips. The axial strips are interconnected at one end. Axial grooves are machined in the outer surface of the plasma confinement tube, and interposed between the axial strips. The conductive film may have a thickness smaller than a skin-depth calculated for a frequency of operation of the induction plasma torch and an electrical conductivity of the conductive material of the film.