Patents by Inventor David Man Chu Lau

David Man Chu Lau 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).

  • Patent number: 10107283
    Abstract: An industrial fluid circulation system and method has at least one fluid circulation circuit in an industrial process, such as an HVAC system. The at least one fluid circulation circuit includes a plurality of pumps, at least two of the pumps connected in parallel to circulate a fluid through the at least one fluid circulation circuit. A separate motor drives each pump and a speed control is used to vary the speed of each motor to thereby vary the pumping capacity of each parallel connected pump. A load detector is provided to sense operating loads on the system, and each operating pump runs at one of: a predetermined equal reduced speed, a predetermined almost equal reduced speed, and a predetermined similar reduced speed, relative to a maximum speed to thereby optimize pump motor power usage in accordance with system operating loads.
    Type: Grant
    Filed: April 17, 2015
    Date of Patent: October 23, 2018
    Inventors: David Man Chu Lau, Ka Lim Shek
  • Publication number: 20150219093
    Abstract: An industrial fluid circulation system and method has at least one fluid circulation circuit in an industrial process, such as an HVAC system. The at least one fluid circulation circuit includes a plurality of pumps connected in parallel to circulate a fluid through the at least one fluid circulation circuit, with at least two of the parallel connected pumps operating at all given loads. A separate motor drives each pump and a speed control is used to vary the speed of each motor to thereby vary the pumping capacity of each parallel connected pump. A load detector is provided to sense operating loads on the system, and each operating pump runs simultaneously at all loads, relative to a maximum pump speed, at a substantially similar reduced speed, a predetermined equal reduced speed or a predetermined almost equal reduced speed.
    Type: Application
    Filed: April 17, 2015
    Publication date: August 6, 2015
    Inventors: David Man Chu LAU, Ka Lim SHEK
  • Patent number: 9032748
    Abstract: An industrial fluid circulating system having at least one fluid circulation circuit, includes a plurality of pumps connected in parallel to circulate the fluid through each of the fluid circulation circuit, a separate motor driving each pump, a load detector to sense operating loads on the system and each circuit, and a speed control to vary the speed of each motor to thereby vary the pumping capacity of each pump in response to the detected load on the system, each pump of each respective circuit running simultaneously at a substantially similar speed or a predetermined equal reduced speed of the respective circuit or an almost equal reduced speed or a similar reduced speed.
    Type: Grant
    Filed: February 22, 2007
    Date of Patent: May 19, 2015
    Inventors: David Man Chu Lau, Ka Lim Shek
  • Publication number: 20090020173
    Abstract: This Invention relates to an industrial process efficiency method and system and relates particularly to a method and system for improving the efficiency and performance of any industrial process when loading is at maximum capacity or under maximum capacity. The system incorporates plurality of identical or similar capacity motor-driven pumps to move liquids, slurries, gases and other fluid or fluid-like material at equal reduced speed or at almost equal reduced speed or at similar reduced speed in lieu of the original/traditional designed comparative inefficient pumping arrangements, thereby, to provide the optimum or same flow capacity with respective to the original pumping arrangement's operating flow capacity. In accordance with the method and system of this invention, significant energy saving can be achieved.
    Type: Application
    Filed: February 22, 2007
    Publication date: January 22, 2009
    Inventors: David Man Chu Lau, Ka Lim Shek