Patents by Inventor Gerhard Dembek

Gerhard Dembek 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).

  • Continuous production process of expandable styrene polymer beads
    Patent number: 5905096
    Abstract: A continuous process for preparing bead-form expandable styrene polymers in which the styrene is prepolymerized in bulk to a conversion of 10 to 80%, the prepolymer is dispersed in liquid form in an aqueous phase in the presence of suspension stabilizers, and the polymerization of the prepolymer is completed in an aqueous suspension to a residual styrene content of less than 2000 ppm.
    Type: Grant
    Filed: January 29, 1998
    Date of Patent: May 18, 1999
    Assignee: BASF Aktiengesellschaft
    Inventors: Peter Nikolaus Lay, Swen Ruck, Michael Schiessl, Michael Witt, Hans Dieter Zettler, Michael Baumgartel, Gerhard Dembek, Klaus Hahn, Jan Holoch, Wolfram Husemann, Knut Kaempfer
  • Fiber reinforced thermoplastic integral skin foams and manufacture thereof
    Patent number: 4940629
    Abstract: Fiber reinforced thermoplastic integral skin foams of density 50-500 kg/m.sup.3 have an outer skin 0.05 to 1.5 mm in thickness and contain from 2 to 60% by weight of reinforcing fibers.
    Type: Grant
    Filed: April 24, 1989
    Date of Patent: July 10, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Heinz Weber, Gerhard Bleckmann, Gerhard Dembek, Gerd Ehrmann, Gerhard Heinz, Lothar Schlemmer
  • Preparation of polyolefin foams
    Patent number: 4894191
    Abstract: Polyolefin foams which have a density of from 30 to 300 g/l, do not exhibit after-shrinkage and possess taut cells are prepared by letting down a polyolefin/blowing agent gel, the latter first being let down to 0.1-10 bar gage pressure and the foam being kept at this pressure until it has cooled to at least 20.degree. C. below the expansion temperature.
    Type: Grant
    Filed: March 4, 1988
    Date of Patent: January 16, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Hermann Tatzel, Ludwig Zuern, Hans D. Zettler, Wolfgang Schneider, Gerhard Dembek