Patents by Inventor Geoffrey John Hamilton Evans

Geoffrey John Hamilton Evans 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).

  • Apparatus and method for sharpening tool blades
    Patent number: 7338351
    Abstract: A sharpening device for the blade of a tool such as a chisel or plane is in two parts. The first is a jig into which the blade is inserted with its tapered end projecting some distance beyond the jig. This distance is related to the angle to which the blade is to be sharpened. The second part is a marked reference member which is brought into a position alongside the jig. The blade is advanced through the jig until its tip reaches a marking on the reference member corresponding to the required sharpening angle for the tool. The tool is then clamped in the jig. The jig incorporates a roller which rolls on the sharpening stone while the tapered tip of the blade is sharpened by contact with the stone.
    Type: Grant
    Filed: April 14, 2006
    Date of Patent: March 4, 2008
    Inventor: Geoffrey John Hamilton Evans
  • Apparatus and method for sharpening tool blades
    Patent number: 7056195
    Abstract: A sharpening device for the blade of a tool such as a chisel or plane is in two parts. The first is a jig into which the blade is inserted with its tapered end projecting some distance beyond the jig. This distance is related to the angle to which the blade is to be sharpened. The second part is a marked reference member which is brought into a position alongside the jig. The blade is advanced through the jig until its tip reaches a marking on the reference member corresponding to the required sharpening angle for the tool. The tool is then clamped in the jig. The jig incorporates a roller which rolls on the sharpening stone while the tapered tip of the blade is sharpened by contact with the stone.
    Type: Grant
    Filed: September 16, 2004
    Date of Patent: June 6, 2006
    Inventor: Geoffrey John Hamilton Evans