Patents by Inventor Keith C. Francis

Keith C. Francis 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).

  • Bleach activation and bleaching compositions
    Patent number: 5106528
    Abstract: Bleaching and detergent compositions are disclosed which upon dissolution in aqueous medium provide a mixture of hydrophobic and cationic peroxyacids. The compositions which are highly effective at removing a wide range of stain types with better background whiteness at bleach solution temperatures of 40.degree. C. and less, comprise a peroxide bleach compound, a hydrophobic peroxyacid (bleach precursor) and a cationic or amphoteric peroxyacid (bleach precursor).
    Type: Grant
    Filed: May 10, 1990
    Date of Patent: April 21, 1992
    Assignee: Lever Brothers Company, Division of Conopco, Inc.
    Inventors: Keith C. Francis, Stephen A. Madison, John Oakes, David W. Thornthwaite
  • Quaternary ammonium compounds for use in bleaching systems
    Patent number: 4904406
    Abstract: A quaternary ammonium-substituted peroxycarboxylic acid bleach precursor, its quaternary ammonium peroxycarboxylic acid derivative, and bleaching-detergent compositions containing these materials are disclosed herein. The bleach precursor structurally comprises a quaternized ammonium group linked to a carboxyl moiety having a leaving group via an aromatic or heterocyclic bridging group which, upon perhydrolysis in the presence of hydrogen peroxide, generates a highly effective, quaternary ammonium-substituted aromatic or heterocyclic peroxycarboxylic acid bleach.
    Type: Grant
    Filed: February 21, 1989
    Date of Patent: February 27, 1990
    Assignee: Lever Brothers Company
    Inventors: James R. Darwent, Keith C. Francis, John Oakes, David W. Thornthwaite