Patents by Inventor Harold H. Gunardson

Harold H. Gunardson 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).

  • Cofiring biosolids in a spent sulfuric acid regeneration facility
    Patent number: 5628976
    Abstract: A process for increasing throughput in a spent sulfuric acid dissociation furnace by injecting dewatered biosolids pre-conditioned to enhance combustion into the furnace while enriching the oxygen content of the air used in the process.
    Type: Grant
    Filed: October 17, 1995
    Date of Patent: May 13, 1997
    Assignee: Air Products and Chemicals
    Inventors: Goutam H. Shahani, Harold H. Gunardson, John M. Fernbacher
  • Control of chemical dosage to a pulp slurry
    Patent number: 5306391
    Abstract: A method is disclosed for controlling a desired chemical dosage to a stream of cellulosic pulp heated by the addition of steam wherein the pulp flow rate is determined indirectly by measuring the pulp temperature after steam addition and calculating the pulp flow rate by heat balance. Changes in pulp flow rate are reflected by changes in pulp temperature at known steam addition rates, and the chemical flow rate is adjusted accordingly to maintain constant chemical dosage. The method is particularly useful in controlling oxygen dosage in oxygen delignification and bleaching processes.
    Type: Grant
    Filed: June 16, 1992
    Date of Patent: April 26, 1994
    Assignee: Air Products and Chemicals, Inc.
    Inventors: John F. Cirucci, Harold H. Gunardson
  • Elevated pressure phthalic anhydride process
    Patent number: 5210223
    Abstract: The present invention is an improvement to the conventional process for the production of phthalic anhydride. In particular, the present invention enables the crude phthalic anhydride product to be recovered in a more efficient manner.
    Type: Grant
    Filed: June 17, 1992
    Date of Patent: May 11, 1993
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Michael S. Chen, Philip J. Cook, Harold H. Gunardson, Melinda B. Ulrich