Patents Assigned to Ralf Hoehn
  • 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