Patents by Inventor Carl T. Buttler

Carl T. Buttler 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).

  • Door lock employing interlocking hinge plates
    Patent number: 4015868
    Abstract: A lock assembly employing cooperating hinge plates interlocked with a removable bolt to prevent the non-hinged edges of a locked panel or door from moving away from its panel or door jambs.
    Type: Grant
    Filed: February 12, 1976
    Date of Patent: April 5, 1977
    Assignee: Kenneth E. Marquis
    Inventor: Carl T. Buttler
  • Safety device for swimming pools
    Patent number: D351010
    Type: Grant
    Filed: September 27, 1993
    Date of Patent: September 27, 1994
    Inventor: Carl T. Buttler