Patents by Inventor Jorgen Hartfelt

Jorgen Hartfelt 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).

  • Abrasive of a microporous polymer matrix with inorganic particles thereon
    Patent number: 4138228
    Abstract: An improved article for preparing critical surfaces, in particular for polishing, comprises means including a surface carrying a polishing abrasive of an average particle size less than 10 microns carried on a polymer matrix which has at least one of the following properties, microporosity, hydrophilicity and weak bonding to the polishing abrasive.
    Type: Grant
    Filed: February 2, 1977
    Date of Patent: February 6, 1979
    Assignee: Ralf Hoehn
    Inventors: Jorgen Hartfelt, Ralf Hoehn