Patents by Inventor Wai K. Cheng

Wai K. Cheng 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).

  • Detection of ethanol emission from a spark ignition engine operating on gasohols
    Patent number: 8589084
    Abstract: Ethanol emissions from a direct ignition spark ignition are measured using mass spectrometry. The method exploits specific fragment ions from ethanol. Ethanol contributes ions of mass number 31, and no other gas species produces ions at this mass number. The method and a device for implementing the method can be used for online detection of ethanol in emissions from engines burning E85 or other ethanol/gasoline mixtures.
    Type: Grant
    Filed: October 8, 2010
    Date of Patent: November 19, 2013
    Assignee: Massachusetts Institute of Technology
    Inventors: Kenneth Kar, Wai K. Cheng
  • DETECTION OF ETHANOL EMISSION FROM A SPARK IGNITION ENGINE OPERATING ON GASOHOLS
    Publication number: 20120089343
    Abstract: Ethanol emissions from a direct ignition spark ignition are measured using mass spectrometry. The method exploits specific fragment ions from ethanol. Ethanol contributes ions of mass number 31, and no other gas species produces ions at this mass number. The method and a device for implementing the method can be used for online detection of ethanol in emissions from engines burning E85 or other ethanol/gasoline mixtures.
    Type: Application
    Filed: October 8, 2010
    Publication date: April 12, 2012
    Inventors: Kenneth Kar, Wai K. Cheng