Patents by Inventor Robert J. Spannuth

Robert J. Spannuth 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).

  • Spent pulping liquor recovery process
    Patent number: 4718978
    Abstract: A partially-oxidized spent pulping liquor is produced which is added to unoxidized strong spent pulping liquor prior, during, or subsequent to concentration to form a novel partially-oxidized, concentrated, high total solids spent pulping liquor. This novel, partially-oxidized, concentrated spent liquor is capable of being combusted in a spent liquor recovery furnace without the addition of auxiliary heating fuel with a resultant increase in the effective capacity of that furnace.
    Type: Grant
    Filed: November 15, 1985
    Date of Patent: January 12, 1988
    Assignee: James River Corporation of Nevada
    Inventors: Robert J. Spannuth, Robert A. Damon
  • Pyrolysis of black liquor at high temperatures using radiant energy
    Patent number: 4637858
    Abstract: This invention is a process for recovering sodium hydroxide directly from black liquor. The process involves pyrolyzing the black liquor in the absence of oxygen to produce a product containing sodium carbide, and hydrolyzing the sodium carbide to form sodium hydroxide. The pyrolysis is carried out at about 4000.degree. F. using radiant energy.
    Type: Grant
    Filed: February 25, 1985
    Date of Patent: January 20, 1987
    Assignee: Crown Zellerbach Corporation
    Inventors: Edwin Matovich, Robert J. Spannuth