Patents by Inventor Cornelis B. Donker

Cornelis B. Donker 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 catalyst composition
    Patent number: 5536441
    Abstract: A bleach catalyst composition in the form of non-friable composite granules comprising:i) a manganese complex catalyst being one of three defined formulae herein;ii) a water-soluble binding agent, preferably selected from soap/fatty acid mixtures, polyethylene glycols of molecular weight in the range 500 to 3000, tallow and coco ethanolamides, nonionic surfactants and mixtures thereof; andiii) an inert solid selected from zeolites, silicas, clays, alumina, titanium dioxide and mixtures thereof; and each granule having a pH within the range from 4.5 to 8.5.The granular, manganese complex-based bleach catalyst composition may be incorporated in detergent and/or bleaching compositions, with good resulting stability and homogeneity of distribution.
    Type: Grant
    Filed: September 1, 1994
    Date of Patent: July 16, 1996
    Assignee: Lever Brothers Company, Division of Conopco, Inc.
    Inventors: Andrew P. Chapple, Jayne E. Nation, William D. Emery, Hermien W. Plomp, Marten R. P. Van Vliet, Cornelis B. Donker, Clemens O. Monir
  • Stable nonaqueous liquid detergents containing a metal oxide of bulk density of 200-1,000 g/l
    Patent number: 5368767
    Abstract: A non-aqueous liquid cleaning composition comprising a particulate solid phase suspended in a non-aqueous liquid phase, wherein the solid phase includes a metal oxide having a bulk density of 200 to 1,000 g/l.
    Type: Grant
    Filed: October 16, 1992
    Date of Patent: November 29, 1994
    Assignee: Unilever Patent Holdings, B.V.
    Inventors: Cornelis B. Donker, Philippus C. van der Hoeven, Mansur S. Mohammadi
  • Stabilization of peroxygen bleach in enzyme-containing heavy duty liquids
    Patent number: 5264142
    Abstract: The present application provides heavy duty liquids in which enzyme stability is maintained without sacrificing peroxygen bleach stability. In one embodiment of the invention stability is provided using protein having a MW of from about 1,000 to about under 50,000. In a second embodiment, stability is provided using a carboxylic acid selected from the group consisting of acetic acid, propionic acid, adipic acid and salts thereof.
    Type: Grant
    Filed: November 25, 1991
    Date of Patent: November 23, 1993
    Assignee: Lever Brothers Company, Division of Conopco, Inc.
    Inventors: John F. Hessel, Daniel J. Kuzmenka, Johannes C. Van De Pas, Cornelis B. Donker, Jack T. McCown
  • Aqueous structured liquid detergent compositions containing selected peroxygen bleach compounds
    Patent number: 5160655
    Abstract: An aqueous structured liquid detergent composition comprising detergents active materials and a peroxygen bleach compound, said detergent composition showing less than 25%, preferably less than 10%, more preferably less than 5% volume increase while stored at a temperature between 20.degree. and 37.degree. C. for three months after preparation.
    Type: Grant
    Filed: November 15, 1991
    Date of Patent: November 3, 1992
    Assignee: Lever Brothers Company, Division of Conopco, Inc.
    Inventors: Cornelis B. Donker, Michael Hull, Johannes C. van de Pas
  • Aqueous liquid abrasive cleaning composition: particulate abrasive suspended in aqueous medium
    Patent number: 4911857
    Abstract: In an aqueous liquid cleaning composition containing anionic synthetic detergent, soap, electrolyte, and particulate abrasive, with the electrolyte being other than tripolyphosphate, the ability to wet a stainless steel surface is enhanced by including 0.01 to 0.5% of polyacrylate or methacrylate having molecular weight of 500 to 3000.
    Type: Grant
    Filed: July 26, 1988
    Date of Patent: March 27, 1990
    Assignee: Lever Brothers Company
    Inventors: David Machin, Cornelis B. Donker, Johannes C. Van de Pas