Patents by Inventor Stuart E. Marshall

Stuart E. Marshall 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).

  • Voltage controlled integrated circuit astable multivibrator
    Patent number: 4336508
    Abstract: Disclosed is an integrated circuit voltage controlled astable multivibrator with external fixed components: resistor RT and capacitor CT. The multivibrator has a center frequency which is a function of: the value of capacitor CT, the amplitude of a constant current Il used to charge and discharge capacitor CT, and a voltage VT. The period timed is proportional to VT/Il where VT is half the voltage swing across capacitor CT. Undesired frequency variations are minimized by generating both current Il and voltage VT in similar matched networks and from the same voltage source so that Il and VT track each other.
    Type: Grant
    Filed: March 24, 1980
    Date of Patent: June 22, 1982
    Assignee: International Business Machines Corporation
    Inventors: Terence G. Cole, Stuart E. Marshall