Patents by Inventor William E. Fristad

William E. Fristad 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).

  • Process for removing lead from sandblasting wastes containing paint chips
    Patent number: 5660806
    Abstract: Heavy metals are efficiently removed from contaminated soil by a process which comprises leaching or washing the soil with a mild leachant solution comprised of an aqueous solution of an acid and a salt. Heavy metals are also efficiently removed from paint chips by washing with an aqueous acid. The heavy metals are recovered from the leachant be cementation.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: August 26, 1997
    Assignee: Henkel Corporation
    Inventors: William E. Fristad, Michael J. Virnig, Dana K. Elliott
  • Method and apparatus for removing metal contamination from soil
    Patent number: 5607060
    Abstract: The invention is a process and an apparatus for removing metal contamination from soil. In the method, the soil is treated to produce soil with a small particle size. The particulate soil is then separated into a coarse fraction and a fine fraction. The coarse fraction and the fine fraction are contacted with a leach solution in separate contacting zones to remove the metal contamination from the soil, the metal is removed from the leach solution and the leach solution recycled to the leaching zones.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: March 4, 1997
    Assignee: Henkel Corporation
    Inventors: William E. Fristad, Jeffrey L. Narum, Phillip L. Mattison, Michael J. Virnig, John Fast
  • Process for removing heavy metals from soil
    Patent number: 5505925
    Abstract: Heavy metals are efficiently removed from contaminated soil by a process which comprises leaching or washing the soil with a mild leachant solution comprised of an aqueous solution of an acid and a salt. Heavy metals are also efficiently removed from paint chips by washing with an aqueous acid. The heavy metals are recovered from the leachant be cementation.
    Type: Grant
    Filed: July 11, 1994
    Date of Patent: April 9, 1996
    Assignee: Cognis, Inc.
    Inventor: William E. Fristad
  • Process for removing heavy metals from paint chips
    Patent number: 5494649
    Abstract: Heavy metals are removed from paint chips by leaching with an aqueous acid. Heavy metals are also efficiently removed from contaminated soil by a process which comprises leaching or washing the soil with a mild leachant solution comprised of an aqueous solution of an acid and a salt. The heavy metals are recovered from the leachant by cementation.
    Type: Grant
    Filed: August 17, 1992
    Date of Patent: February 27, 1996
    Assignee: Cognis, Inc.
    Inventors: William E. Fristad, Michael J. Virnig, Jonathan M. Cassel, Dana K. Elliot
  • Method and apparatus for removing metal contamination from soil
    Patent number: 5466426
    Abstract: The invention is a process and an apparatus for removing metal contamination from soil. In the method, the soil is treated to produce soil with a small particle size. The particulate soil is then separated into a coarse fraction and a fine fraction. The coarse fraction and the fine fraction are contacted with a leach solution in separate contacting zones to remove the metal contamination from the soil, the metal is removed from the leach solution and the leach solution recycled to the leaching zones.
    Type: Grant
    Filed: August 11, 1993
    Date of Patent: November 14, 1995
    Assignee: Cognis, Inc.
    Inventors: William E. Fristad, Jeffrey L. Narum, Phillip L. Mattison, Michael J. Virnig, John Fast
  • Manganese compound catalyzed oligomerization reactions and products thereof
    Patent number: 5106541
    Abstract: Oligomers and addition products obtained from the reaction of a saturated or olefinically unsaturated carboxylic acid, alcohol, ether, or ester with a substituted or unsubstituted acetic anhydride in the presence of a Mn compound, and processes for their preparation.
    Type: Grant
    Filed: January 9, 1990
    Date of Patent: April 21, 1992
    Assignee: Henkel Research Corporation
    Inventors: William E. Fristad, Alan G. Olivero, Steven Young, Christopher S. Sykes, Brock M. Siegel