Patents by Inventor David B. Charles

David B. Charles 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: D291339
    Type: Grant
    Filed: February 25, 1985
    Date of Patent: August 11, 1987
    Inventor: David B. Charles