Patents by Inventor Richard Biljetina

Richard Biljetina 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).

  • Solids concentrating anaerobic digestion process and apparatus
    Patent number: 4735724
    Abstract: A non-mixed vertical tower anaerobic digester and anaerobic digestion process provides passive concentration of biodegradable feed solids and microorganisms in an upper portion of a continuous digester volume and effluent withdrawal from the middle to bottom portion of the digester, resulting in increased solids retention times, reduced hydraulic retention times, and enhanced bioconversion efficiency. In addition, due to passive concentration of solids, the non-mixed anaerobic digester accommodates high solids loadings and provides separation of microbial phases within the continuous digester volume to achieve substantially complete bioconversion of biodegradable feedstock components.
    Type: Grant
    Filed: July 30, 1986
    Date of Patent: April 5, 1988
    Assignee: Gas Research Institute
    Inventors: David P. Chynoweth, Vipul J. Srivastava, Richard Biljetina, Thomas D. Hayes