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:
Jul. 07, 1987
Filed:
Oct. 21, 1985
Salvador L Camacho, Raleigh, NC (US);
David P Camacho, Raleigh, NC (US);
Plasma Energy Corporation, Raleigh, NC (US);
Abstract
An apparatus for starting and maintaining a plasma arc is disclosed, which comprises a plasma arc torch composed of a rear electrode and a front tubular member, with the tubular member acting as a collimator in transfer arc operation or as an electrode in non-transfer arc operation. The power circuit includes a main DC power supply, an electrical pulse generator in series with the plasma torch, and a protective capacitor connected between the main power supply and pulse generator. To initiate the arc, a high voltage pulse is generated by the pulse generator, which has sufficient power to strike an arc which extends from the rear electrode to an external workpiece in the case of transfer arc operation. The main power supply is used only to maintain the established arc, and thus may have a relatively small voltage capacity.