Patents by Inventor William H. Greenwald

William H. Greenwald 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).

  • Fireplace grate
    Patent number: D256612
    Type: Grant
    Filed: August 28, 1978
    Date of Patent: August 26, 1980
    Assignee: National Utility Products Company
    Inventors: Carl W. Knight, Richard G. Hart, William H. Greenwald