Patents by Inventor William Davis Metzger

William Davis Metzger 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).

  • Hole saw centering device
    Patent number: 6409437
    Abstract: A cone shaped hole saw centering device for locating a hole saw where a hole larger than the pilot bit of the hole saw already exists. The device is simple with no attachment or adjustment necessary. It would locate a hole saw on any size hole from the inside diameter of the hole saw to the outside diameter of the pilot bit with or without the pilot bit being used.
    Type: Grant
    Filed: October 16, 2000
    Date of Patent: June 25, 2002
    Inventor: William Davis Metzger