Patents by Inventor Friedemann Müller

Friedemann Müller 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 continuous preparation of thermoplastically processable polyurethanes with improved softening properties
    Patent number: 6930163
    Abstract: Process for the continuous preparation of thermoplastically processable polyurethane elastomers with improved softening properties is disclosed. The process is carried out in a tubular reactor at a ratio of the circumferential speed of the stirrer (in m/sec) in the tubular reactor and the throughput (in g/sec) of >0.03 m/g.
    Type: Grant
    Filed: May 17, 2000
    Date of Patent: August 16, 2005
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Bräuer, Wolfgang Kaufhold, Friedemann Müller, Jürgen Winkler, Herbert Heidingsfeld, Wolfgang Röhrig, Hans-Georg Hoppe
  • Process for producing thermally stable thermoplastic polyurethanes
    Patent number: 6624278
    Abstract: A continuous process for the production of thermoplastically processable polyurethane elastomer is disclosed. The process comprise adding acid H compounds in an amount calculated to control and render constant the melt viscosity of the product. The inventive elastomer has constant melt flow behavior and high thermal stability.
    Type: Grant
    Filed: December 3, 2001
    Date of Patent: September 23, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Friedemann Müller, Wolfgang Bräuer, Hans-Georg Hoppe, Hans-Georg Wussow, Hans Wagner
  • Thermoplastic resins having incorporated mold release agents
    Patent number: 6552153
    Abstract: A mixture of hydroxy-terminated hydrocarbons useful as a mold release agent for polymers is disclosed. The polymers suitable in the present context are the ones prepared by polyaddition or polycondensation, in particular, thermoplastic polyurethane and polyurethane urea.
    Type: Grant
    Filed: July 20, 1999
    Date of Patent: April 22, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Kaufhold, Friedemann Müller, Wolfgang Bräuer, Hans-Georg Hoppe, Hans-Georg Wussow
  • Continuous preparation of melt-processable polyurethane in a twin screw extruder
    Patent number: 6294637
    Abstract: The invention relates to a process for the continuous preparation of melt-processable polyurethanes, wherein an isocyanate-terminated prepolymer is intensively mixed with chain extender at temperatures of <200° C., and the mixture obtained is converted to melt processable polyurethane in a twin screw extruder under quasi-adiabatic reaction conditions.
    Type: Grant
    Filed: August 27, 1998
    Date of Patent: September 25, 2001
    Assignee: Bayer AG
    Inventors: Wolfgang Bräuer, Friedemann Müller, Jürgen Winkler, Herbert Heidingsfeld