Patents by Inventor Donald L. Bates

Donald L. Bates 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).

  • Demountable signboards
    Patent number: 4683670
    Abstract: A signboard of a type used to carry replaceable letters or similar indicia can be improved by using at least one easily operated holder to connect the signboard to a support such as a wall. This permits the signboard to be easily removed from the support so that it can be held in a convenient manner as the content of a sign on the signboard is changed or altered.
    Type: Grant
    Filed: October 25, 1985
    Date of Patent: August 4, 1987
    Assignee: Eldon Industries, Inc.
    Inventor: Donald L. Bates