Patents by Inventor Donald Dunbar Howard

Donald Dunbar Howard 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).

  • A.C. powered speed up circuit
    Patent number: 4092551
    Abstract: An improved speed up circuit, especially useful with high speed, push pull circuits, is disclosed. This uses only A.C. power to discharge the interelectrode and depletion capacitances of an output transistor thereby eliminating uncontrolled shunt current from the output to ground through the output transistor thereby allowing the output to reach the desired level in a shorter period of time. These desirable results are accomplished by capacitively coupling a resistor-transistor speed up circuit to the base of the output transistor to actively pull the base of the output transistor to ground and discharge the inherent interelectrode and depletion capacitances of the output transistor.
    Type: Grant
    Filed: May 20, 1976
    Date of Patent: May 30, 1978
    Assignee: International Business Machines Corporation
    Inventors: Donald Dunbar Howard, Helmut Schettler