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:
Aug. 03, 1993
Filed:
Feb. 13, 1991
Gerhard Frind, Altamont, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
Strike-over in an RF plasma gun is eliminated by interposing a grounded isolation device between the plasma jet and the RF coil which supplies energy to the plasma. The isolation device comprises a plurality of separated segments spaced apart in a circumferential direction and electrically connected together at one end and to ground potential. The shield substantially eliminates the parasitic distributed capacitance between the RF coil and the plasma by interrupting the electrical field coupling between the coil and the plasma and shunting most of the capacitive current flow to ground. The invention enables reliable operation of the device at frequencies in the 2-4 MHz range.