Patents by Inventor Guenther Pfirrmann

Guenther Pfirrmann 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).

  • Large blow moldings made from polyethylene
    Patent number: 6913729
    Abstract: Large blow moldings are made from polyethylene of density ??0.94 g/cm3 and of melt flow rate MFR 190/21.6<50 g/10 min, and of notched tensile impact strength azK (?30° C.) not less than 300 kJ/m2 and bursting strength, determined by a drop height test at ?18° C., of more than 3 m. Processes for producing large blow moldings of this type involve annealing large blow moldings after production. The moldings are used for storage and transport of hazardous materials.
    Type: Grant
    Filed: January 3, 2002
    Date of Patent: July 5, 2005
    Assignee: Elenac GmbH
    Inventors: Günther Pfirrmann, Dieter Lilge, Günter Hatzmann, Dieter Boes
  • Process for increasing the flame resistance of polyethylene-containing hollowware
    Patent number: 6387314
    Abstract: A process for increasing the flame resistance of polyethylene-containing, single- or multilayer hollowware, in particular plastic fuel tanks, by heat treating the hollowware at 60-135° C.
    Type: Grant
    Filed: December 8, 1999
    Date of Patent: May 14, 2002
    Assignee: Basell Polyolefin GmbH
    Inventors: Wolfgang Rohde, Günther Pfirrmann, Peter Bauer, Andreas Haufe, Joachim Koch
  • Stabilization of polyethylene grit
    Patent number: 5461097
    Abstract: A process is described for stabilizing polyethylene grit in which a sterically hindered phenol and an ester of phosphorous or of hypophosphorous acid are added to said grit, wherein the sterically hindered phenol in melt form and the ester of phosphorous or of hypophosphorous acid are made available to the polyethylene grit within a ground polyolefin matrix in which the ester is incorporated, the polyolefin matrix being compatible with the polyethylene grit.
    Type: Grant
    Filed: December 1, 1993
    Date of Patent: October 24, 1995
    Assignee: BASF Aktiengesellschaft
    Inventors: Guenther Pfirrmann, Dieter Boes, Rudolf Paatz