Patents by Inventor William C. Christopfel

William C. Christopfel 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).

  • Method of reducing oral malodor
    Patent number: 6325997
    Abstract: A method of reducing oral malodor includes providing a solution of sodium chlorite and a metal ion capable of complexing with sulfur and applying the solution as mouth rinse.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: December 4, 2001
    Assignee: Oxyfresh Worldwide, Inc.
    Inventor: William C. Christopfel
  • Method of reducing oral malodor
    Patent number: 5753217
    Abstract: A method of reducing oral malodor includes providing a solution of sodium chlorite and a metal ion capable of complexing with sulfur and applying the solution as mouth rinse.
    Type: Grant
    Filed: August 14, 1996
    Date of Patent: May 19, 1998
    Assignees: William C. Christopfel, M. E. Saremi
    Inventor: William C. Christopfel
  • Coordination complexes of optically active phosphine compounds
    Patent number: 4464306
    Abstract: The invention is a new family of phosphine compounds which can be used to make optically active metal coordination complex catalysts which combine high efficiency with a capability of performing rapidly (high efficiency and rapidly being established from Tables I, II and III as being greater than 75% efficiency and in times of not more than a few hours, preferably less than one hour) in water and thus avoiding solvent recovery and loss problems. The catalysts can be used in some alcoholic mediums as well as in some aqueous mediums. These catalysts are useful in catalytic asymmetric hydrogenation of some olefinic compounds. The new phosphine compounds are made from novel phosphine oxides.
    Type: Grant
    Filed: January 19, 1983
    Date of Patent: August 7, 1984
    Assignee: Monsanto Company
    Inventors: William C. Christopfel, William S. Knowles
  • Optically active phosphine compounds
    Patent number: 4376870
    Abstract: The invention is a new family of phosphine compounds which can be used to make optically active metal coordination complex catalysts which combine high efficiency with a capability of performing rapidly (high efficiency and rapidly being established from Tables I, II and III as being greater than 75% efficiency and in times of not more than a few hours, preferably less than one hour) in water and thus avoiding solvent recovery and loss problems. The catalysts can be used in some alcoholic mediums as well as in some aqueous mediums. These catalysts are useful in catalytic asymmetric hydrogenation of some olefinic compounds. The new phosphine compounds are made from novel phosphine oxides.
    Type: Grant
    Filed: December 5, 1980
    Date of Patent: March 15, 1983
    Assignee: Monsanto Company
    Inventors: William C. Christopfel, William S. Knowles