Patents by Inventor Bernhard Hierholzer

Bernhard Hierholzer 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).

  • CATALYST FOR THE POLYMERIZATION OF OLEFINS, PROCESS FOR ITS PREPARATION AND ITS USE
    Publication number: 20020013217
    Abstract: The present invention relates to a supported catalyst for the polymerization of olefins, which can be prepared by reacting the reaction product formed from an aluminoxane and at least one metallocene with a microporous, polymeric support.
    Type: Application
    Filed: March 31, 1993
    Publication date: January 31, 2002
    Applicant: Hans-Friedrich Herrmann
    Inventors: HANS-FRIEDRICH HERRMANN, BERND BACHMANN, BERNHARD HIERHOLZER, WALTER SPALECK
  • Natural circulation reactor and use for producing linear and cyclic acetals
    Patent number: 5955041
    Abstract: This invention relates to a reactor 1 for the continuous production of linear or cyclic acetals, in particular trioxane, dioxolane, tetroxane, dimethoxymethane, diethoxymethane, diethoxyethane and dibutoxyethane. This reactor has internal adjacently arranged evaporator elements 2, which allow for flow-through of a heat transport medium, and which are at least two meters high so as to generate a thermosiphon flow. The clear cross section between the evaporator elements is 20 to 80% of the overall cross section. Using the reactor, circulation ratios of up to 250 can be achieved. Thus, the reliability and availability of a production plant is increased while the susceptibility to breakdown decreases.
    Type: Grant
    Filed: September 27, 1995
    Date of Patent: September 21, 1999
    Assignee: Hoechst AG
    Inventors: Dieter Arnold, Bernhard Hierholzer, Hubert Wloch, Karl-Friedrich Muck
  • Catalyst for the polymerization of olefins, process for its preparation and its use
    Patent number: 5942586
    Abstract: Catalyst for the polymerization of olefins, process for its preparation, and its use.The present invention relates to a supported catalyst for the polymerization of olefins, which can be prepared by reacting the reaction product formed from an aluminoxane and at least one metallocene with a microporous, polymeric support.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: August 24, 1999
    Assignee: Targor GmbH
    Inventors: Hans-Friedrich Herrmann, Bernd Bachmann, Bernhard Hierholzer, Walter Spaleck
  • Process for removing trioxane from an aqueous mixture
    Patent number: 5766424
    Abstract: A process for removing trioxane from a liquid mixture containing trioxane, water and formaldehyde, which includes distilling the liquid mixture in a first distillation stage at a low pressure, distilling the resulting distillate in a second distillation stage at a higher pressure and taking off trioxane as bottom product.
    Type: Grant
    Filed: July 17, 1996
    Date of Patent: June 16, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Dieter Arnold, Bernhard Hierholzer, Karl-Friedrich Muck, Monika Reiss, Peter Richter, Hans-Dietmar Schnabel, Hubert Wloch