Patents by Inventor George W. Chang

George W. Chang 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).

  • Particulate substrates for improved recovery of microbes
    Patent number: 8026093
    Abstract: Specially modified microbial growth surfaces improve bacterial recovery or counts when testing for the presence or absence of microbial cells or performing microbial enumerations.
    Type: Grant
    Filed: November 10, 2008
    Date of Patent: September 27, 2011
    Assignee: The Regents of the University of California
    Inventors: Rosalind Tung, George W. Chang
  • Particulate Substrates for Improved Recovery of Microbes
    Publication number: 20100120026
    Abstract: Specially modified microbial growth surfaces improve bacterial recovery or counts when testing for the presence or absence of microbial cells or performing microbial enumerations.
    Type: Application
    Filed: November 10, 2008
    Publication date: May 13, 2010
    Inventors: Rosalind Tung, George W. Chang
  • Method for detecting coliform and E. coli bacteria
    Patent number: 5643743
    Abstract: A novel highly sensitive method for detection of the presence of total coliform and E. coli in water samples, food products, and seafood employs a new type of media having composition which allows an unequivocal detection of very small number of E. coli. The new low pH media which contain trimethylamine-N-oxide promote the growth of chlorine or food processing injured E. coli for their easier detection.
    Type: Grant
    Filed: December 29, 1994
    Date of Patent: July 1, 1997
    Assignee: The Regents of the University of California
    Inventors: George W. Chang, Rosalind A. Lum
  • Method for determination of E. coli in water
    Patent number: 5411867
    Abstract: A novel highly sensitive method for detection of the presence of total coliform and E. coli in water samples, food products, and seafood. The method employs new type of media having composition which allows an unequivocal detection of very small number of E. coli. The new low pH media which contains trimethylamine-N-oxide promote the growth of chlorine or food processing injured E. coli for their easier detection. The method for sole detection of E. coli in water, in food products and in seafood.
    Type: Grant
    Filed: August 12, 1993
    Date of Patent: May 2, 1995
    Assignee: The Regents of the University of California
    Inventors: George W. Chang, Rosalind A. Lum