Patents by Inventor Jan Zwinselman

Jan Zwinselman 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).

  • Use of polyhydroxycarboxylamides as EP additives
    Patent number: 5952274
    Abstract: The invention relates to the use of polyhydroxycarboxylamides as an extreme pressure (EP) additive, in particular for lubricants, metalworking fluids and hydraulic fluids. The invention also relates to an extreme pressure (EP) additive containing at least one amide of a polyhydroxycarboxylic acid. Preferred polyhydroxycarboxylamides are the amides of gluconic acid and of glucoheptonic acid.
    Type: Grant
    Filed: August 26, 1997
    Date of Patent: September 14, 1999
    Assignee: Schill & Seilacher GmbH & Co.
    Inventors: Horst Rieckert, Karl-Heinz Michel, Jan Zwinselman