Patents by Inventor Kåre Spang

Kåre Spang 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).

  • Patent number: 6334809
    Abstract: For users of chain saws it is known that the chain saw teeth should rather often be sharpened by filing in order to keep them well cutting. Traditionally, such a sharpening is effected by means of a straight filing rod moved in a reciprocal manner, but according to the invention it is realized that it is better to arrange the rod as a rotary circular or screw shaped formation, whereby the teeth can be worked in a simplified manner.
    Type: Grant
    Filed: November 22, 1999
    Date of Patent: January 1, 2002
    Inventor: Kåre Spang