Patents by Inventor Chuh Hwa Luh

Chuh Hwa Luh 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).

  • Method for controlling motor-driven pump in a fluid system
    Patent number: 11290049
    Abstract: A method for controlling a motor-driven pump in communication with a fluid system is provided. Preferably the method employs a frequency drive system to control the motor-driven pump. The control method is characterized in that the operating frequency of the motor can be adjusted very quickly and it is ensured to be operated in a safe frequency range no more than a rated current.
    Type: Grant
    Filed: July 13, 2020
    Date of Patent: March 29, 2022
    Inventor: Chuh Hwa Luh
  • METHOD FOR CONTROLLING MOTOR-DRIVEN PUMP IN A FLUID SYSTEM
    Publication number: 20210028738
    Abstract: A method for controlling a motor-driven pump in communication with a fluid system is provided. Preferably the method employs a frequency drive system to control the motor-driven pump. The control method is characterized in that the operating frequency of the motor can be adjusted very quickly and it is ensured to be operated in a safe frequency range no more than a rated current.
    Type: Application
    Filed: July 13, 2020
    Publication date: January 28, 2021
    Inventor: Chuh Hwa Luh
  • Rotary actuator and application thereof
    Patent number: 10801328
    Abstract: A specially designed rotary actuator comprising a sealed container and a piston rotor located in the sealed container. The piston rotor divides the sealed container into a first space and a second space having different pressures. The first end of the piston rotor faces the first space and includes a plurality of first bores, and the second end of the piston rotor faces the second space and includes a plurality of second bores. The depth of the first and second bores is less than the thickness of the piston rotor. Each of the first and second bores comprises a first portion and a second portion, wherein the surface area of the first portion is greater than the surface area of the second portion.
    Type: Grant
    Filed: April 11, 2019
    Date of Patent: October 13, 2020
    Inventor: Chuh Hwa Luh
  • ROTARY ACTUATOR AND APPLICATION THEREOF
    Publication number: 20200270994
    Abstract: A specially designed rotary actuator comprising a sealed container and a piston rotor located in the sealed container. The piston rotor divides the sealed container into a first space and a second space having different pressures. The first end of the piston rotor faces the first space and includes a plurality of first bores, and the second end of the piston rotor faces the second space and includes a plurality of second bores. The depth of the first and second bores is less than the thickness of the piston rotor. Each of the first and second bores comprises a first portion and a second portion, wherein the surface area of the first portion is greater than the surface area of the second portion.
    Type: Application
    Filed: April 11, 2019
    Publication date: August 27, 2020
    Inventor: Chuh Hwa Luh