Patents by Inventor Charles Nathaniel Knowlton

Charles Nathaniel Knowlton 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).

  • Patent number: 6133226
    Abstract: Tumble dryer articles having a fabric conditioning composition providing anti-static softening, stain removal, stain guard and anti-active build-up benefits in an automatic clothes dryer are described. The composition comprises 3 to 80 wt. % of a nonionic surfactant having an HLB value of greater than 11, 3 to 50 wt. % of an anionic surfactant, 0 to 80 wt. % of a non-surfactant release aid and up to 25 wt. % of an aqueous ingredient provided the total amount of the nonionic and anionic surfactant is 20 wt. % or more and the ratio of the aqueous ingredient to the anionic surfactant is less than 2:1.
    Type: Grant
    Filed: April 4, 1997
    Date of Patent: October 17, 2000
    Assignee: Lever Brothers Company, division of Conopco, Inc.
    Inventors: Charles Nathaniel Knowlton, Nancy Pergament, Feng-Lung Gordon Hsu
  • Patent number: 5712239
    Abstract: The present invention relates to liquid detergent compositions comprising:(1) 1-80% by wt. surfactant;(2) defined peroxyacid; and(3) 0.01-20% by wt. of a mono substituted phenolic compound.The compounds help to extend the half life of the peracid bleaches in such compositions. The invention further relates to a method of incorporating stability of surfactant compositions comprising peracid bleaches which method comprises adding 0.01-2.0% by wt. of said substituted phenolic compound to the composition.
    Type: Grant
    Filed: April 8, 1996
    Date of Patent: January 27, 1998
    Assignee: Lever Brothers Company, Division of Conopco, Inc.
    Inventors: Charles Nathaniel Knowlton, Janet Coope, Daniel Kuzmenka, Mark Stephen Naser
  • Patent number: 5674828
    Abstract: The present invention relates to liquid detergent compositions comprising:(1) 1-80% by wt. surfactant;(2) defined peroxyacid; and(3) 0.01-20% by wt. of N-oxide compound.The N-oxide compounds help to extend the half life of the peracid bleaches in such compositions. The invention further relates to a method of incorporating stability of surfactant compositions comprising peracid bleaches which method comprises adding 0.01-2.0% by wt. of said N-oxide compound to the composition.
    Type: Grant
    Filed: April 8, 1996
    Date of Patent: October 7, 1997
    Assignee: Lever Brothers Company, Division of Conopco, Inc.
    Inventors: Charles Nathaniel Knowlton, Janet Coope, Daniel Kuzmenka, Mark Stephen Naser, Leslie Jo Morgan