Patents by Inventor Hendrik de Ruijter

Hendrik de Ruijter 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).

  • Dye-transfer-inhibiting compositions and particulate detergent compositions containing them
    Patent number: 6274664
    Abstract: A free-flowing granular polymer composition suitable for incorporation into a particulate detergent composition comprises a defined dye-transfer-inhibiting polymer, preferably poly(4-vinylpyridine) sodium carboxymethyl betaine chloride, and a silica-based carrier material. A preferred carrier material is an acidic silica. The silica-based carrier material may optionally comprise a solid acid, for example, polyacrylic acid or phthalic acid.
    Type: Grant
    Filed: July 8, 1999
    Date of Patent: August 14, 2001
    Assignee: Unilever Home & Personal Care USA, division of Conopco, Inc.
    Inventors: Derek William Emery, Neil Jones, Hendrik de Ruijter, Antonius Henricus J Strijbosch
  • Dye-transfer-inhibiting compositions and particulate detergent compositions containing them
    Patent number: 6117834
    Abstract: A free-flowing granular polymer composition suitable for incorporation into a particulate detergent composition comprises a defined dye-transfer-inhibiting polymer, preferably poly(4-vinylpyridine) sodium carboxymethyl betaine chloride, and a carrier material comprising zeolite and a solid acid, for example, polyacrylic acid.
    Type: Grant
    Filed: July 8, 1999
    Date of Patent: September 12, 2000
    Assignee: Unilever Home & Personal Care U.S.A.
    Inventors: Hendrik de Ruijter, Antonius Henricus J Strijbosch
  • Encapsulated bleach particles
    Patent number: 5747441
    Abstract: An encapsulated bleach particle is provided, comprising(a) 1-30% by weight of a coating including a gelled polymer material (as herein defined);(b) 99-70% by weight of a core material selected from the group consisting of a peroxygen bleach compound, a bleach catalyst, and a bleach precursor.This particle was found to have both favourable storage stability and good solubility characteristics. Furthermore, a process for producing encapsulated particles having said composition is provided.
    Type: Grant
    Filed: September 26, 1996
    Date of Patent: May 5, 1998
    Assignee: Lever Brothers Company, Division of Conopco, Inc.
    Inventors: Bastiaan Domburg, Anshu M. Gupta, Hendrik de Ruijter, Antonius Henricus J. Strijbosch