Patents by Inventor Stanley J. Pirt

Stanley J. Pirt 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 degrading organic matter
    Patent number: 5540839
    Abstract: A cyclical process for degrading waste organic matter to gaseous products and substantially zero volume of solid matter by subjecting the waste alternately and cyclically to stages of mesophilic and thermophilic digestion in which the organisms from one stage are inactivated and become a substrate for the organisms in the next stage, this inactivation resulting from a temperature shift. At the end of the cycle, solids are collected and returned to the first microbial digestion stage for recycling together with a fresh input of waste.
    Type: Grant
    Filed: February 28, 1994
    Date of Patent: July 30, 1996
    Assignee: Pirtferm Limited
    Inventor: Stanley J. Pirt