Patents by Inventor Changrak Choi

Changrak Choi 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).

  • Controllable normal force mechanism with minimum energy consumption
    Patent number: 9321466
    Abstract: Force control system. The system includes a first pair of permanent magnets for providing a normal force on the wheel of a robot adapted for n-pipe inspections. A second pair of magnets is provided with opposite polarity so that a rotor containing magnets may be rotated with a minimum of torque required and therefore with a minimum of energy expended.
    Type: Grant
    Filed: April 1, 2013
    Date of Patent: April 26, 2016
    Assignees: Massachusetts Institute of Technology, King Fahd University of Petroleum and Minerals
    Inventors: Changrak Choi, Dimitrios Chatzigeorgiou, Rached Ben-Mansour, Kamal Youcef-Toumi
  • Leak detection system based on force transduction
    Patent number: 8869599
    Abstract: Leak detection system. A rigid body is resiliently supported within an outer cage. Structure is provided for detecting displacement of the rigid body with respect to the outer cage, the displacement indicating a leak when the rigid body is moved by a suction force generated by a local pressure gradient resulting from a leak within a pipe network. The invention allows a leak to be determined around the circumference of a pipe.
    Type: Grant
    Filed: January 23, 2012
    Date of Patent: October 28, 2014
    Assignees: Massachusetts Institute of Technology, King Fahd University of Petroleum & Minerals
    Inventors: Rached Ben-Mansour, Dimitrios Chatzigeorgiou, Atia Khalifa, Changrak Choi, Kamal Youcef-Toumi
  • Controllable Normal Force Mechanism with Minimum Energy Consumption
    Publication number: 20140290763
    Abstract: Force control system. The system includes a first pair of permanent magnets for providing a normal force on the wheel of a robot adapted for n-pipe inspections. A second pair of magnets is provided with opposite polarity so that a rotor containing magnets may be rotated with a minimum of torque required and therefore with a minimum of energy expended.
    Type: Application
    Filed: April 1, 2013
    Publication date: October 2, 2014
    Applicant: Massachusetts Institute of Technology
    Inventors: Changrak Choi, Dimitrios Chatzigeorgiou, Rached Ben-Mansour, Kamal Youcef-Toumi
  • LEAK DETECTION SYSTEM BASED ON FORCE TRANSDUCTION
    Publication number: 20130186181
    Abstract: Leak detection system. A rigid body is resiliently supported within an outer cage. Means are provided for detecting displacement of the rigid body with respect to the outer cage, the displacement indicating a leak when the rigid body is moved by a suction force generated by a local pressure gradient resulting from a leak within a pipe network. The invention allows a leak to be determined around the circumference of a pipe.
    Type: Application
    Filed: January 23, 2012
    Publication date: July 25, 2013
    Applicants: King Fahd University of Petroleum and Minerals, Massachusetts Institute of Technology
    Inventors: Rached Ben-Mansour, Dimitrios Chatzgeorgiou, Atia Khalifa, Changrak Choi, Kamal Youcef-Toumi