Patents by Inventor André FELLHÖLTER

André FELLHÖLTER 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 preparation of polyisocyanates with a biuret structure
    Patent number: 8445623
    Abstract: The present invention relates to an improved process for the preparation of polyisocyanates with a biuret structure by continuous reaction of excess amounts of organic diisocyanates having exclusively aliphatically and/or cycloaliphatically bonded isocyanate groups with organic diamines having exclusively aliphatically and/or cycloaliphatically bonded primary amino groups at elevated temperatures by 2-stage addition of the isocyanate component.
    Type: Grant
    Filed: August 23, 2010
    Date of Patent: May 21, 2013
    Assignee: Bayer MaterialScience AG
    Inventors: Martin Brahm, Dieter Mager, André Fellhoelter, Reinhard Halpaap
  • PROCESS FOR THE PREPARATION OF POLYISOCYANATES WITH A BIURET STRUCTURE
    Publication number: 20110046300
    Abstract: The present invention relates to an improved process for the preparation of polyisocyanates with a biuret structure by continuous reaction of excess amounts of organic diisocyanates having exclusively aliphatically and/or cycloaliphatically bonded isocyanate groups with organic diamines having exclusively aliphatically and/or cycloaliphatically bonded primary amino groups at elevated temperatures by 2-stage addition of the isocyanate component.
    Type: Application
    Filed: August 23, 2010
    Publication date: February 24, 2011
    Applicant: Bayer MaterialScience AG
    Inventors: Martin Brahm, Dieter Mager, André FELLHÖLTER, Reinhard Halpaap
  • Chambered circulation evaporator
    Patent number: 6685801
    Abstract: A circulation evaporator for separating mixtures having more volatile and less volatile components. The circulation evaporator contains an evaporator, a discharge container connected to the evaporator by a connecting piece, a condenser, a vacuum pump, a recirculating line, a feed line and an outflow line. The discharge container contains a chamber for feed and a chamber for outflow. The invention further relates to a process for the separation by distillation of a mixture having more volatile and less volatile components by employing the circulation evaporator.
    Type: Grant
    Filed: May 16, 2002
    Date of Patent: February 3, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Kurt-Manfred Küpper, Andre Fellhölter