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:
May. 11, 1999
Filed:
Dec. 18, 1997
Seiji Sato, Nagoya, JP;
Hisashi Yamada, Nagoya, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A power supply apparatus for an electric discharge machine comprises a first power supply device comprising a high impedance circuit connected in series to a DC power supply unit and a second power supply device comprising a low impedance circuit, intermittently applies a pulse voltage to a space between a tool electrode and a workpiece opposite to the tool electrode with a specified gap therebetween from the first power supply device, and also supplies a machining current to the space from the second power supply device after generation of electric discharge, in which the second power supply device provides therein a plurality units of switching devices connected in parallel to each other, the number of ON-units switching circuit for controlling the number of switching devices to be simultaneously turned ON, and an ON-time control unit for variably controlling ON-time of the switching devices.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile