Patents by Inventor Lonnie Machen

Lonnie Machen 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: 4132015
    Abstract: A mathematical teaching-learning aid to facilitate teaching and learning a wide range of fundamental concepts and skills associated with numeration systems and computers, comprising an indicating board, a base board and number marker elements, and in an alternate embodiment a base-converter board.
    Type: Grant
    Filed: April 14, 1977
    Date of Patent: January 2, 1979
    Inventor: Lonnie Machen