Patents by Inventor Carolyn Ellsworth

Carolyn Ellsworth 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: 4010556
    Abstract: The specification discloses an electronic mathematics trainer including a problem sheet bearing a plurality of arithmetic problems. An arithmetic problem display holder receives the problem sheet and includes lamps therein for sequentially being illuminated to indicate sequential ones of the arithmetic problems to be solved. A keyboard encoder enables a student to manually enter the arithmetic problem presently illuminated on the problem sheet. A display unit displays the arithmetic problem which is entered into the encoder. Circuitry is provided to compute the correct answer to the arithmetic problem entered into the encoder, along with at least one incorrect answer. The incorrect and correct answers are displayed on the display unit. Structure is provided to enable the selection of one of the displayed answers. If the correct answer is selected, the answer to the problem is then displayed adjacent the displayed problem.
    Type: Grant
    Filed: June 4, 1975
    Date of Patent: March 8, 1977
    Assignee: Carolyn Ellsworth
    Inventors: Carolyn Ellsworth, L. W. Herring