Patents by Inventor P. H. Wallman

P. H. Wallman 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).

  • Oil shale retorting process with raw shale preheat prior to pyrolysis
    Patent number: 4332669
    Abstract: Disclosed is an improved process for retorting oil shale in a staged turbulent bed retort wherein the raw shale feed particles are classified and deaerated into first and second fractions, said first fraction containing substantially only shale particles above about 25 mesh. The first fraction is then preheated with hot shale fines in a dilute phase lift pipe prior to retorting.
    Type: Grant
    Filed: May 27, 1980
    Date of Patent: June 1, 1982
    Assignee: Chevron Research Company
    Inventors: Byron G. Spars, Paul W. Tamm, P. H. Wallman