Patents by Inventor Hilbert Esselbrugge

Hilbert Esselbrugge 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).

  • Stabilized foam control compositions, their preparation, and use
    Publication number: 20040180806
    Abstract: The present invention relates to stabilized foam control compositions, their method of preparation, and their use. The stabilized foam control compositions can be used to control foam in a wide variety of processes and products.
    Type: Application
    Filed: March 6, 2003
    Publication date: September 16, 2004
    Inventors: Hilbert Esselbrugge, Rob de Bruijn
  • Stabilized foam control compostions for lubricating compositons and their use
    Publication number: 20040176259
    Abstract: The invention relates to stabilized foam compositions for lubricating compositions and their use in lubricating compositions, particularly metal working fluids.
    Type: Application
    Filed: March 6, 2003
    Publication date: September 9, 2004
    Inventors: Hilbert Esselbrugge, Rob de Bruijn
  • Article for the controlled delivery of an active substance, comprising a hollow space fully enclosed by a wall and filled in full or in part with one or more active substances
    Patent number: 5496557
    Abstract: An article for the controlled delivery of an active substance, comprising a hollow space fully enclosed by a wall and filled in full or in part with one or more active substances, which wall is made using a biodegradable polymeric material permeable to the active substance, wherein the wall is composed mainly of a combination of at least two different polymeric materials in which one polymeric material is permeable to the active substance and is degradable and the other polymeric material is relatively poorly permeable to the active substance and is degradable and the conveyor path for the delivery of the active substance from the hollow space to the surroundings of the article is a continuous distance leading at least through the polymeric material permeable to the active substance.
    Type: Grant
    Filed: August 24, 1993
    Date of Patent: March 5, 1996
    Assignee: Akzo N.V.
    Inventors: Jan Feijen, Hilbert Esselbrugge