Patents by Inventor Charles R. Lindberg

Charles R. Lindberg 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).

  • Hybrid pulse width modulated audio amplifier
    Patent number: 4471314
    Abstract: A high power single or multichanneled pulse width modulated (PWM) audio amplifier is fabricated in a single package using hybrid assembly techniques.
    Type: Grant
    Filed: June 15, 1981
    Date of Patent: September 11, 1984
    Inventor: Charles R. Lindberg
  • Temperature compensated bipolar reference voltage circuit
    Patent number: 4280090
    Abstract: A circuit design suitable for use with monolithic semiconductor fabrication techniques which provides two accurate reference voltages, one of which is a certain calculatable percentage greater than, the other of which is the same percentage less than, a fixed reference voltage. The magnitude of this voltage window is set by selection of the value of a single resistor which is connected between a single connection point in the circuit and ground. The two accurate reference voltages are fully compensated for changes in temperature.
    Type: Grant
    Filed: March 17, 1980
    Date of Patent: July 21, 1981
    Assignee: Silicon General, Inc.
    Inventor: Charles R. Lindberg