Patents by Inventor Jan Laarkamp

Jan Laarkamp 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).

  • Patent number: 3937674
    Abstract: Petroleum resin comprising units of cyclopentadiene, methyl cyclopentadiene or both is reacted at 150.degree.-320.degree.C with an unsaturated fatty acid, such as tall oil fatty acid, in the presence of magnesium oxide or other metal compound for a period of time until a modified resin having a melting point of at least 125.degree.C, preferably 140.degree.-160.degree.C is obtained. The resulting resins are especially useful as binding and thickening agents for printing ink resulting in an ink that dries rapidly and is resistant to rubbing.
    Type: Grant
    Filed: September 19, 1972
    Date of Patent: February 10, 1976
    Assignee: Stamicarbon N.V.
    Inventor: Jan Laarkamp