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:
Jan. 16, 1990
Filed:
Sep. 06, 1988
Harald L Witting, Burnt Hills, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
A novel excitation coil for both starting and maintaining a plasma arc discharge within the envelope of an arc tube in an electrodeless HID lamp, has first and second solenoidally - wound coil portions, each having an axis substantially in alignment with the axis of the other portion. The coil conductor of each portion may be disposed upon the surface of an imaginary cone having its vertex situated within the arc tube, or beyond the arc tube and within the volume of the other coil portion. The ends of each of the solenoid portions furthest from one another are connected together, and the remaining closely-positioned coil ends provide a sufficiently high starting potential, responsive to receiving an excitation signal, for providing a magnetic field; at any instant the magnetic field of each of the two portions combines in-phase in the volume, between the closer ends of both portions, into which the arc tube is normally inserted.