Patents by Inventor by Esther L. Leach, executrix

by Esther L. Leach, executrix 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).

  • Attachment device for electrical discharge machine
    Patent number: 5977503
    Abstract: A rotating spindle attachment device particularly useful in electrical discharge machining for detachably mounting an electrode to the ram of an electrical discharge machine (EDM). The unit incorporates an electric drive motor, threaded drive shaft, detachable electrode chuck, and water-tight seal(s) for use in mounting, sealing, and rotating a consumable electrode about its vertical axis relative to the workpiece.
    Type: Grant
    Filed: November 3, 1997
    Date of Patent: November 2, 1999
    Inventors: Thomas S. Leach, deceased, by Esther L. Leach, executrix, Robert A. Leach