Patents by Inventor Charles G. T. Evans

Charles G. T. Evans 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).

  • Production of hyaluronic acid
    Patent number: 5411874
    Abstract: A process for the production of hyaluronic acid by continuous fermentation of Streptococcus equi in a chemostat culture gives high yields of high molecular weight hyaluronic acid uncontaminated by toxic impurities. The process is advantageous in that it solves the problem of traditional batch culture in which degradation enzymes can begin to break down the cell walls of Streptococcus releasing cell contents into the fermenter broth, leading to purification difficulties.
    Type: Grant
    Filed: July 6, 1993
    Date of Patent: May 2, 1995
    Assignee: Fermentech Medical Limited
    Inventors: Derek C. Ellwood, Charles G. T. Evans, Geoffrey M. Dunn, Neil McInnes, Richard G. Yeo, Keith J. Smith
  • Production of bacterial polysaccharides
    Patent number: 4696900
    Abstract: Polysaccharides are produced by single stage continuous culture of Xanthomonas bacteria, especially of the Xanthomonas campestris group in a chemically-defined culture medium. Cultures have been run for over 2,000 hours without reduction in the polysaccharide yield. The physical and chemical properties of the product can be controlled by selection of the growth limiting substrate (limiting nutrilite) in the culture medium to give a range of polysaccharides suitable for various applications.
    Type: Grant
    Filed: June 6, 1984
    Date of Patent: September 29, 1987
    Assignee: The Secretary of State for Defence in Her Majesty's Government of the United Kingdon of Great Britain and Northern Ireland
    Inventors: Derek C. Ellwood, Charles G. T. Evans, Richard G. Yeo