Patents by Inventor Eckhardt Weidner

Eckhardt Weidner 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).

  • Process for the production of polyurethane particles
    Patent number: 6548619
    Abstract: The present invention relates to a process for the production of particles from solutions or melts of heat-activatable polyurethanes by i) dissolving a compressible auxiliary agent at a pressure of between 50 and 1000 bar into a conveyable solution or melt of a heat-activatable polyurethane to obtain a mixture of polyurethane, compressible auxiliary agent and optionally solvent, ii) optionally adjusting of the temperature of the resulting mixture to a temperature of from 40° K below to 150° K above the crystallite melting point of the polyurethane, iii) expanding the mixture by means of an expansion device into a container, while adjusting the temperature in the container to at least 5° K below the softening temperature of the polyurethane to maintain the open jet particles in a form in which they do not agglomerate, and iv) separating the formed particles from the stream of decompressed compressible auxiliary agent and optionally solvent.
    Type: Grant
    Filed: August 10, 2001
    Date of Patent: April 15, 2003
    Inventors: Alexander Pross, Heinz-Werner Lucas, Horst Stepanski, Eckhardt Weidner, Marcus Petermann, Andreas Kilzer
  • Process for the production of polyurethane particles
    Publication number: 20020049298
    Abstract: The present invention relates to a process for the production of particles from solutions or melts of heat-activatable polyurethanes by
    Type: Application
    Filed: August 10, 2001
    Publication date: April 25, 2002
    Inventors: Alexander Pross, Heinz-Werner Lucas, Horst Stepanski, Eckhardt Weidner, Marcus Petermann, Andreas Kilzer