Patents by Inventor Jaechang HA

Jaechang HA 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).

  • Three-stage hydraulic actuator and method of operating the same
    Patent number: 10151330
    Abstract: Disclosed herein is a three-stage hydraulic actuator. The three-stage hydraulic actuator includes a pressurizing chamber, a distribution chamber and an acceleration chamber. The pressurizing chamber has therein separated spaces respectively charged with compressed gas and compressed oil. The distribution chamber is provided to communicate with the pressurizing chamber and is charged with oil pressurized by the compressed oil charged into the pressurizing chamber. The acceleration chamber communicates with the distribution chamber through a distributing orifice. An acceleration piston is installed in the acceleration chamber and is moved forward when the pressurized oil is supplied from the distribution chamber to the acceleration chamber.
    Type: Grant
    Filed: December 2, 2014
    Date of Patent: December 11, 2018
    Assignee: AGENCY FOR DEFENSE DEVELOPMENT
    Inventors: Taehyeong Kim, Yoonjae Kim, Changwon Shul, Jaechang Ha
  • THREE-STAGE HYDRAULIC ACTUATOR AND METHOD OF OPERATING THE SAME
    Publication number: 20150152896
    Abstract: Disclosed herein is a three-stage hydraulic actuator. The three-stage hydraulic actuator includes a pressurizing chamber, a distribution chamber and an acceleration chamber. The pressurizing chamber has therein separated spaces respectively charged with compressed gas and compressed oil. The distribution chamber is provided to communicate with the pressurizing chamber and is charged with oil pressurized by the compressed oil charged into the pressurizing chamber. The acceleration chamber communicates with the distribution chamber through a distributing orifice. An acceleration piston is installed in the acceleration chamber and is moved forward when the pressurized oil is supplied from the distribution chamber to the acceleration chamber.
    Type: Application
    Filed: December 2, 2014
    Publication date: June 4, 2015
    Inventors: Taehyeong KIM, Yoonjae KIM, Changwon SHUL, Jaechang HA