Patents by Inventor David Prahl

David Prahl 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).

  • Phone placard
    Patent number: D379994
    Type: Grant
    Filed: June 27, 1995
    Date of Patent: June 17, 1997
    Assignee: Ameritech Services, Inc.
    Inventors: Gerard A. Stratelak, Gary B. Volpe, Karen Frick, David Prahl
  • Phone placard
    Patent number: D385886
    Type: Grant
    Filed: September 11, 1996
    Date of Patent: November 4, 1997
    Assignee: Ameritech Services, Inc.
    Inventors: Gerard A. Stratelak, Gary B. Volpe, Karen Frick, David Prahl