Patents by Inventor Gerhard Behrendt

Gerhard Behrendt 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).

  • Polyurethane gels and method for the production thereof
    Patent number: 8535572
    Abstract: Polyurethane gels are produced by converting a polyurethane system comprising (A1) one or more polyether alcohols of hydroxyl number 28 to 90 mg KOH/g produced primarily from propylene oxide added to a starter molecule of hydroxyl functionality between 2 and 4, (A2) one or more polyether alcohols of hydroxyl number 240 to 850 mg KOH/g produced primarily from propylene oxide added to a starter molecule of hydroxyl functionality between 2 and 4, (b1) one or more diisocyanates, (B2) one or more triisocyanates preferably produced by trimerisizing diisocyanates, (A3) at least one additive material fulfilling a prescribed function, and (A4) at least one additive material having a particle size in the range from 1 to 650 nm in the presence of one or more catalysts (A5) for forming polyurethane.
    Type: Grant
    Filed: March 25, 2009
    Date of Patent: September 17, 2013
    Assignee: GT Elektrotechnische Produckte GmbH
    Inventors: Tsvetomir Tsonev, Uwe Paulman, Gerhard Behrendt
  • POLYURETHANE GELS AND METHOD FOR THE PRODUCTION THEREOF
    Publication number: 20110140053
    Abstract: Polyurethane gels are produced by converting a polyurethane system comprising (A1) one or more polyether alcohols of hydroxyl number 28 to 90 mg KOH/g produced primarily from propylene oxide added to a starter molecule of hydroxyl functionality between 2 and 4, (A2) one or more polyether alcohols of hydroxyl number 240 to 850 mg KOH/g produced primarily from propylene oxide added to a starter molecule of hydroxyl functionality between 2 and 4, (b1) one or more diisocyanates, (B2) one or more triisocyanates preferably produced by trimerisizing diisocyanates, (A3) at least one additive material fulfilling a prescribed function, and (A4) at least one additive material having a particle size in the range from 1 to 650 nm in the presence of one or more catalysts (A5) for forming polyurethane.
    Type: Application
    Filed: March 25, 2009
    Publication date: June 16, 2011
    Applicant: GT ELEKTROTECHNISCHE PRODUKTE
    Inventors: Tsvetomi Tsonev, Uwe Paulmann, Gerhard Behrendt
  • Method for producing polyols and polyols
    Patent number: 6683119
    Abstract: The present invention provides an improved process for producing polyols from polyurethane wastes. The polyols produced by that process are further used to generate polyurethanes. According to the present invention polyurethane wastes are added to a mixture of at least one diol and at least one secondary alkyl amine and reacted at temperatures in the range of 120 to 220° to produce a mixture of polyether alcohols with a dissolved or dispersed mixture of substituted ureas.
    Type: Grant
    Filed: April 26, 2001
    Date of Patent: January 27, 2004
    Assignees: Epik Entwicklung Und Produktion Innovativer Kunstoffe GmbH
    Inventor: Gerhard Behrendt