Patents by Inventor Koji Terui

Koji Terui has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of, and an apparatus for, electrical-discharge machining
    Patent number: 5336863
    Abstract: A method for electrical-discharge machining ("EDM") of a workpiece (W) in the work tank (T) using water and oil based working fluids, the method involving die-sink EDMing using a water based working fluid, and then discharging the water based working fluid from a machined portion formed between a tool electrode (EL) and the workpiece (W) and replacing it with an oil-based working fluid. The process involves removing the water based working fluid remaining in the machined portion through electrical-discharge machining after the initial replacing process, and then carrying out electrical-discharge machining using an oil-based working fluid under the required working conditions after the water-removing process.When electrical-discharge machining is carried out by changing from a water based working fluid to an oil based working fluid according to the invention, the water based working fluid remaining in the machined portion is completely and easily removed without the need for handwork.
    Type: Grant
    Filed: January 7, 1993
    Date of Patent: August 9, 1994
    Assignee: Sodick Co., Ltd.
    Inventor: Koji Terui