Patents by Inventor Delmer L. Hybertson

Delmer L. Hybertson 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).

  • Sidewalk grooving tool
    Patent number: 5236277
    Abstract: An improved sidewalk grooving tool usable by a standing worker but having foldable handles for flat storage and transport.
    Type: Grant
    Filed: June 19, 1992
    Date of Patent: August 17, 1993
    Inventor: Delmer L. Hybertson
  • Sidewalk scribing tool
    Patent number: 4921372
    Abstract: A tool for scribing lines in soft concrete in which the line can be impressed by a standing operator. Guides are provided on the tool to assure a proper angle of the scribed line. A grooving tool can then follow the scribed line without added guide because the line will be located and all rough aggregate in the concrete will have been moved out of the path of the grooving tool.
    Type: Grant
    Filed: November 6, 1989
    Date of Patent: May 1, 1990
    Inventor: Delmer L. Hybertson