Patents by Inventor Chi Cheung Chung

Chi Cheung Chung 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).

  • Air purifier
    Patent number: 6660070
    Abstract: An air purifier includes a cabinet, an electrically driven fan, a replaceable filter element, and an air quality sensor. A display provides a visual indication of the air quality condition. A microprocessor is programmed to control the speed of the fan automatically according to the air quality condition. The microprocessor also computes when the filter element must be changed by totalling the time of operation and its speed (which equals air quality) so that for example the filter element will be changed more often (used for less aggregate time) when the air purifier is operated in a poor quality environment.
    Type: Grant
    Filed: November 30, 2001
    Date of Patent: December 9, 2003
    Assignee: Simatelex Manufactory Co., Ltd.
    Inventors: Chi Cheung Chung, Stephen Wai-Kin Chan, Wing-Chung Li
  • Air purifier
    Publication number: 20020078830
    Abstract: An air purifier comprises a cabinet an electrically driven fan a replaceable filter element and an air quality sensor A display provides a visual indication of the air quality condition. A microprocessor is programmed to control the speed of the fan automatically according to the air quality condition. The microprocessor also computes when the filter element must be changed by totalling the time of operation and its speed (which equals air quality) so that for example the filter element will be changed more often (used for less aggregate time) when the air purifier is operated in a poor quality environment.
    Type: Application
    Filed: November 30, 2001
    Publication date: June 27, 2002
    Inventors: Chi-Cheung Chung, Stephen Wai-Kin Chan, Wing-Chung Li