Patents by Inventor John E. Sinko

John E. Sinko 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).

  • Universal lawn mower blade sharpening machine
    Patent number: 5062322
    Abstract: A self contained electric motor drive lawn mower blade sharpening machine for use in sharpening most conventional rotary lawn mower blades. The machine includes a base for mounting the motor drive with abrasive wheel, and a free-floating blade guide which allows sharpening of unevenly worn blades to a beveled angle of thirty degrees along the contoured cutting edge.
    Type: Grant
    Filed: September 28, 1989
    Date of Patent: November 5, 1991
    Inventor: John E. Sinko