Patents by Inventor David Lee Keune

David Lee Keune 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: 3964039
    Abstract: A luminescent solid state status indicator including at least first and second light emitting diodes of different colors which may be mounted on a single header. One side of each of the diodes is connected in common to one side of a source of energizing voltage subject to variation in magnitude. The other sides of the diodes are interconnected with the electrodes of a transistor which has one electrode connected to the other side of the DC energizing voltage. The transistor is adapted selectively to energize the first and second light emitting diodes to display colors corresponding respectively to discrete magnitudes of said energizing voltage.
    Type: Grant
    Filed: December 24, 1974
    Date of Patent: June 15, 1976
    Assignee: Monsanto Company
    Inventors: Magnus George Craford, David Lee Keune