Patents by Inventor Donald L. Lipke

Donald L. Lipke 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: 4326236
    Abstract: A control system for providing controllable direct current power for energizing an electromagnetic brake having an alternating current power supply and a power rectifier for converting and supplying direct current power to the brake. A power switch controls the amount of direct current power supplied to the brake. A control circuit controls the actuation of the power switch and includes a brake control actuating a variable output transformer. The output from the transformer is converted to a variable pulse width signal for actuating the power switch. Preferably, the transformer is a variable ratio transformer having a movable core connected to the operator's control. A battery charger and batteries may be connected to the ouput of the power rectifier for maintaining brake power in the event of alternating current line failure. Multiple transistor power switches connected to separate brake coils maintain a portion of brake power in the event of partial equipment failure.
    Type: Grant
    Filed: September 10, 1979
    Date of Patent: April 20, 1982
    Assignee: Baylor Company
    Inventors: Willie L. McNair, Donald L. Lipke, Stanley H. Van Wambeck, Conrad J. Huelsman
  • Patent number: 4156210
    Abstract: The specification discloses a regulated temperature compensated current source in combination with a self resonant oscillator. The current source receives an unregulated DC voltage and compensates the DC voltage with a negative current coefficient. A current source circuit receives the compensated DC voltage in order to generate a regulated current. The current source circuitry has a positive temperature coefficient to thereby provide temperature compensation to the generated current. The oscillator includes a resonant transformer connected at the ends thereof to first and second transistors. A pair of voltage detectors are also connected across the ends of the transformer for receiving drive current and for rendering alternate ones of the transistors conductive in dependence upon which end of the transformer is at the highest potential.
    Type: Grant
    Filed: March 20, 1978
    Date of Patent: May 22, 1979
    Assignee: Biometrics Instrument Corp.
    Inventor: Donald L. Lipke
  • Patent number: 4151415
    Abstract: An imaging system for detection of a target is provided which compensates for range dependency of a reflected interrogating signal. The imaging system includes an electromagnetic radiation source for generating a series of interrogating pulse signals directed towards the target. A receiver is triggered for receiving the reflected interrogating pulse signals from the target during variable time intervals and for generating a resultant output signal. The receiving time intervals are varied such that the number of reflected interrogating pulse signals received by the receiver is dependent on the distance between the receiver and the target. The receiver thus generates a constant amplitude resultant output signal independent of the distance between the receiver and target.
    Type: Grant
    Filed: October 31, 1977
    Date of Patent: April 24, 1979
    Assignee: Varo, Inc.
    Inventor: Donald L. Lipke
  • Patent number: 4044249
    Abstract: The specification discloses a voltage supply system particularly adapted for use as an automatic brightness control for an image intensifier tube. The system includes a power oscillator for applying a constant A.C. voltage to a first multiplier which generates at least one constant D.C. voltage for application to the screen of the image intensifier tube. A regulator circuit includes a low power oscillator which generates a control A.C. signal and which further includes circuitry responsive to the screen current of the image intensifier tube for varying the amplitude of the control A.C. signal. The frequency of the control A.C. signal is substantially greater than the frequency of the constant A.C. voltage. A bilateral attenuator receives the constant A.C. voltage and is operable in response to the control A.C. signal for varying the amplitude of the constant A.C. voltage. A second multiplier is connected to the output of the attenuator for generating a variable D.C.
    Type: Grant
    Filed: December 15, 1975
    Date of Patent: August 23, 1977
    Assignee: A Division of Varo, Inc. Biometrics Instrument Corporation
    Inventors: Charles E. Moore, Jr., Sammy L. Crane, Donald L. Lipke