Patents by Inventor Christopher Drewnoski

Christopher Drewnoski 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).

  • Mechanical pencil
    Patent number: 6942410
    Abstract: A mechanical carpenter's pencil having an integral sharpening guide providing a reference surface to which the lead may be trimmed for sharpening. The pencil user may use a knife to trim the lead flush with the sharpening guide surface or may abrade the lead on a convenient surface until the lead is flush with the sharpening guide surface. After trimming, the lead is advanced to expose the freshly sharpened point and is ready for precision marking.
    Type: Grant
    Filed: June 22, 2004
    Date of Patent: September 13, 2005
    Inventor: Christopher Drewnoski