Patents by Inventor David S. Harper

David S. Harper 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).

  • Welsh miner's lamp
    Patent number: D266366
    Type: Grant
    Filed: September 10, 1979
    Date of Patent: September 28, 1982
    Assignee: Mayer Mill Mining and Trade Company
    Inventor: David S. Harper