Patents by Inventor R. Korneffel

R. Korneffel 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: 4077738
    Abstract: A time modulated position controller is provided comprising a hydraulic actuator having a cylinder and a piston slidably disposed in the cylinder thus defining a chamber within the cylinder. An electric solenoid valve functions upon actuation to permit fluid communication from a source of fluid pressure to the cylinder chamber while, conversely, upon deactuation of the solenoid valve, the valve functions to exhaust fluid from the cylinder chamber. A position transducer, which generates a signal in response to the axial position of the piston within the cylinder, is coupled to one input of a differential amplifier while a control line, having an analog signal is coupled to the second input of the differential amplifier. The error output from the differential amplifier is time modulated to produce a square wave with a variable duty cycle which in turn is used to activate the solenoid valve.
    Type: Grant
    Filed: December 29, 1975
    Date of Patent: March 7, 1978
    Assignee: Teledyne Industries, Inc.
    Inventors: W. A. Keely, R. Korneffel