Patents by Inventor Eugene T. Ihlenfeldt

Eugene T. Ihlenfeldt 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).

  • Automatic thermocouple reference junction compensator
    Patent number: 4157663
    Abstract: A system for automatic cold-junction referencing of thermocouples in temperature controllers wherein a differential amplifier is used to amplify the thermocouple signal prior to establishing the cold-junction compensation and measuring range. This permits the use of command signals from any floating or single-ended source, making the controller compatible with existing traditional command generators and with computer systems with digital-to-analog converters. The amplifier isolates the thermocouple from the remainder of the circuitry such that it can be grounded on the heated part.
    Type: Grant
    Filed: April 25, 1978
    Date of Patent: June 12, 1979
    Assignee: The Boeing Company
    Inventors: Eugene T. Ihlenfeldt, David E. Marshall
  • Automatic thermocouple reference junction compensator
    Patent number: RE30735
    Abstract: A system for automatic cold-junction referencing of thermocouples in temperature controllers wherein a differential amplifier is used to amplify the thermocouple signal prior to establishing the cold-junction compensation and measuring range. This permits the use of command signals from any floating or single-ended source, making the controller compatible with existing traditional command generators and with computer systems with digital-to-analog converters. The amplifier isolates the thermocouple from the remainder of the circuitry such that it can be grounded on the heated part.
    Type: Grant
    Filed: June 9, 1980
    Date of Patent: September 8, 1981
    Assignee: The Boeing Company
    Inventors: Eugene T. Ihlenfeldt, David E. Marshall