Patents by Inventor Chong-Do Park

Chong-Do Park 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).

  • Vacuum gauge using peltier tip
    Patent number: 6727709
    Abstract: A thermal conduction vacuum gauge using a Peltier tip is provided. The vacuum gauge for measuring the pressure in a vacuum chamber includes: a signal generator that drives an electric current; an ammeter connected to the signal generator for measuring the current; a bridge circuit consisting of junctions of thermocouple wires, which is connected to the ammeter, wherein one junction of the dissimilar metallic wires is made in the form of a Peltier tip inserted into the vacuum chamber; and a lock-in amplifier connected to the two symmetrical points of the bridge circuit for detecting a voltage signal due to the temperature oscillation at the Peltier tip and thus measuring the pressure in the vacuum chamber.
    Type: Grant
    Filed: November 30, 2001
    Date of Patent: April 27, 2004
    Assignee: Pohang University of Science and Technology Foundation
    Inventors: Yoon-Hee Jeong, Dae-Hwa Jung, Suk-Min Chung, Chong-Do Park
  • Vacuum gauge using peltier tip
    Publication number: 20020163345
    Abstract: A thermal conduction vacuum gauge using a Peltier tip is provided. The vacuum gauge for measuring the pressure in a vacuum chamber includes: a signal generator that drives an electric current; an ammeter connected to the signal generator for measuring the current; a bridge circuit consisting of junctions of thermocouple wires, which is connected to the ammeter, wherein one junction of the dissimilar metallic wires is made in the form of a Peltier tip inserted into the vacuum chamber; and a lock-in amplifier connected to the two symmetrical points of the bridge circuit for detecting a voltage signal due to the temperature oscillation at the Peltier tip and thus measuring the pressure in the vacuum chamber.
    Type: Application
    Filed: November 30, 2001
    Publication date: November 7, 2002
    Applicant: Pohang University of Science and Technology Foundation
    Inventors: Yoon-Hee Jeong, Dae-Hwa Jung, Suk-Min Chung, Chong-Do Park