Patents by Inventor David J. Krichten

David J. Krichten 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).

  • Process for reabsorption and retention of phosphorous by activated biomass
    Patent number: 4257897
    Abstract: A process for promoting the reabsorption and retention by an activated biomass of phosphorous values previously contained by the biomass and released under anaerobic conditions, which process requires initially subjecting the biomass in admixture with a liquid medium to treatment under aerobic conditions employing a relatively high DO. When the pH of the mixture stops increasing, the aerobic treatment is continued but under a second, reduced DO level.
    Type: Grant
    Filed: October 26, 1979
    Date of Patent: March 24, 1981
    Assignee: Air Products and Chemicals, Inc.
    Inventors: David J. Krichten, David M. Nicholas