Patents by Inventor Ronald Van Den Dool

Ronald Van Den Dool 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).

  • Process for oxidising dialdehyde polysaccharides
    Publication number: 20050106686
    Abstract: Dialdehyde carbohydrates such as dialdehyde starch (DAS) can be oxidised with oxygen or hydrogen peroxide in the presence of a laccase or another enzyme capable of oxidation. The oxidation is mediated by a di-tertiary nitroxyl such as TEMPO. The products contain both aldehyde groups and carboxyl groups and have excellent properties as wet strength agents.
    Type: Application
    Filed: November 7, 2002
    Publication date: May 19, 2005
    Inventors: Jan Jetten, Evert Timmerman, Arie Besemer, Ronald Van Den Dool, Johannes Wilhelmus Boumans
  • Oxidized cellulose-containing fibrous materials and products made therefrom
    Patent number: 6824645
    Abstract: The present invention relates to a cellulose-containing fibrous material, wherein hydroxy groups were oxidized at the C(6) of glucose units of the cellulose into aldehyde and/or carboxy groups, a paper or nonwoven (product) made therefrom, in particular tissue (products) and a process for their manufacture. The paper or nonwoven (products) of the invention display excellent strength properties.
    Type: Grant
    Filed: August 16, 2001
    Date of Patent: November 30, 2004
    Assignees: SCA Hygiene Products GmbH, SCA Hygiene Products Zeist B.V.
    Inventors: Thomas Jaschinski, Susanna Gunnars, Arie Cornelis Besemer, Petter Bragd, Jan Matthijs Jetten, Ronald Van Den Dool, Willem Van Hartingsveldt
  • Process for selective oxidation of cellulose
    Patent number: 6716976
    Abstract: A process for oxidizing cellulose, in which a nitroxyl compound such as TEMPO is oxidized using an oxidizing agent in the presence of a complex of a transition metal such as Mn, Fe, Cu, and a complexing agent such as a polyamine, or an oxidative enzyme, and the resulting nitrosonium ion is used to selectively oxidize cellulose 6-hydroxy-methylene groups to carbaldehyde groups and carboxylic acid groups.
    Type: Grant
    Filed: November 21, 2001
    Date of Patent: April 6, 2004
    Assignee: SCA Hygiene Products Zeist B.V.
    Inventors: Jan Matthijs Jetten, Ronald Van Den Dool, Wim Van Hartingsveldt, Arie Cornelis Besemer
  • Oxidized cellulose-containing fibrous materials and products made therefrom
    Publication number: 20020098317
    Abstract: The present invention relates to a cellulose-containing fibrous material, wherein hydroxy groups were oxidized at the C(6) of glucose units of the cellulose into aldehyde and/or carboxy groups, a paper or nonwoven (product) made therefrom, in particular tissue (products) a process for their manufacture. The paper or nonwoven (products) of the invention display excellent strength properties.
    Type: Application
    Filed: August 16, 2001
    Publication date: July 25, 2002
    Inventors: Thomas Jaschinski, Susanna Gunnars, Arie Cornelis Besemer, Petter Bragd, Jan Matthijs Jetten, Ronald Van Den Dool, Willem Van Hartingsveldt