Patents by Inventor Michael PROKEIN

Michael PROKEIN 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).

  • METHOD FOR THE DYEING OF LEATHER AND DYED LEATHER HAVING A HIGH RUBBING FASTNESS
    Publication number: 20230141950
    Abstract: A method for dyeing leather with an organic colorant in a supercritical fluid. The method includes coating a surface of the leather to provide a coated surface of the leather. The method further includes dyeing the coated surface of the leather with the organic colorant in the supercritical fluid.
    Type: Application
    Filed: June 28, 2021
    Publication date: May 11, 2023
    Applicant: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
    Inventors: Michael Prokein, Manfred Renner
  • Method for hydrophobising leather, and leather produced by means of same
    Patent number: 10947605
    Abstract: The invention relates to a method for hydrophobising leather, comprising the steps: providing tanned, at least partly dried leather whose content of free water is in the range of from 0 to 25 wt. %, based on the weight of the dried leather, treating the leather with a mixture of compressed gas and a hydrophobising agent at a pressure of at least 30 bar in a pressure vessel, and relieving the pressure of the pressure vessel to ambient pressure. By using the method according to the invention it is possible to obtain leather which is hydrophobised at the surface, as well as thick and firm, deeply hydrophobised leather, as is used, for example, for shoe soles.
    Type: Grant
    Filed: January 12, 2017
    Date of Patent: March 16, 2021
    Assignee: FRAUNHOFER-GESELLSCHAFT ZUR FORDERUNG DER ANGEWAND
    Inventors: Manfred Renner, Andreas Sengespeick, Michael Prokein, Eckhard Weidner
  • METHOD FOR HYDROPHOBISING LEATHER, AND LEATHER PRODUCED BY MEANS OF SAME
    Publication number: 20190017129
    Abstract: The invention relates to a method for hydrophobising leather, comprising the steps: providing tanned, at least partly dried leather whose content of free water is in the range of from 0 to 25 wt. %, based on the weight of the dried leather, treating the leather with a mixture of compressed gas and a hydrophobising agent at a pressure of at least 30 bar in a pressure vessel, and relieving the pressure of the pressure vessel to ambient pressure. By using the method according to the invention it is possible to obtain leather which is hydrophobised at the surface, as well as thick and firm, deeply hydrophobised leather, as is used, for example, for shoe soles.
    Type: Application
    Filed: January 12, 2017
    Publication date: January 17, 2019
    Inventors: Manfred RENNER, Andreas SENGESPEICK, Michael PROKEIN, Eckhard WEIDNER