Patents by Inventor David Walz

David Walz 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).

  • Tape recorder
    Patent number: D257252
    Type: Grant
    Filed: June 28, 1978
    Date of Patent: October 7, 1980
    Assignees: Olympus Optical Co., Ltd., Lanier Business Products, Inc.
    Inventors: Yasuo Hattori, David Walz