Patents by Inventor Robert G. Hagstrom

Robert G. Hagstrom 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).

  • Patent number: 4671801
    Abstract: An integrated, continuous (or batch) process for the beneficiation and/or liquefaction of coal, especially low rank coals, is provided, the process generally involving admixing coal with an organic liquid medium under high shear agitation, further beneficiating the coal by admixing the same in an aqueous medium optionally containing a monomer and a polymerization catalyst therefor and subjecting the resultant coal product to further high shear agitation in the presence of certain organic liquid media to provide a liquefied coal extract product and a further solid coal product. Beneficiated solid and liquefied coal products are also provided.
    Type: Grant
    Filed: July 19, 1985
    Date of Patent: June 9, 1987
    Assignee: The Standard Oil Company
    Inventors: Lester E. Burgess, Robert G. Hagstrom, David E. Herman, Phillip E. McGarry