Patents by Inventor William Croonenberg

William Croonenberg 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: D255828
    Type: Grant
    Filed: October 4, 1978
    Date of Patent: July 8, 1980
    Assignee: Thetford Corporation
    Inventors: Frederick A. Butler, William Croonenberg