Patents by Inventor Lembit Tuttelberg

Lembit Tuttelberg 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).

  • Method for the vinylation of amides
    Patent number: 9249094
    Abstract: A process for preparing an N-vinyl compound by vinylating a compound having at least one nitrogen atom (referred to hereinafter as compound for short) with acetylene, wherein before the vinylation, the compound is reacted with an alkali metal hydroxide in a reaction zone and the mean residence time of the alkali metal hydroxide and of the compound in the reaction zone is less than 6 minutes.
    Type: Grant
    Filed: December 8, 2008
    Date of Patent: February 2, 2016
    Assignee: BASF SE
    Inventors: Regina Vogelsang, Stefan Kaeshammer, Wolfgang Staffel, Ulrich Eiden, Alexandra Brand, Lembit Tuttelberg
  • PROCESS FOR REMOVING BY-PRODUCTS FROM N-VINYLAMIDES
    Publication number: 20110245510
    Abstract: A process for removing by-products from N-vinylamide-rich product mixtures (crude N-vinylamide), which comprises performing an extraction of the crude N-vinylamide with an organic solvent as the extractant.
    Type: Application
    Filed: November 12, 2009
    Publication date: October 6, 2011
    Applicant: BASF SE
    Inventors: Wolfgang Staffel, Regina Vogelsang, Roland Kessinger, Lembit Tuttelberg, Bernd Heida
  • PROCESS FOR PREPARING N-VINYLPYRROLIDONE FROM LACTONE-FREE PYRROLIDONE
    Publication number: 20110034706
    Abstract: A process for preparing N-vinylpyrrolidone by reacting 2-pyrrolidone with acetylene, wherein the 2-pyrrolidone used as a starting material (referred to hereinafter as starting 2-pyrrolidone) comprises less than 1 part by weight of ?-butyrolactone per 100 parts by weight of 2-pyrrolidone.
    Type: Application
    Filed: November 26, 2008
    Publication date: February 10, 2011
    Applicant: BASF SE
    Inventors: Wolfgang Staffel, Stefan Kaeshammer, Roland Kessinger, Regina Vogelsang, Axel Paul, Lembit Tuttelberg
  • METHOD FOR THE VINYLATION OF AMIDES
    Publication number: 20100249434
    Abstract: A process for preparing an N-vinyl compound by vinylating a compound having at least one nitrogen atom (referred to hereinafter as compound for short) with acetylene, wherein before the vinylation, the compound is reacted with an alkali metal hydroxide in a reaction zone and the mean residence time of the alkali metal hydroxide and of the compound in the reaction zone is less than 6 minutes.
    Type: Application
    Filed: December 8, 2008
    Publication date: September 30, 2010
    Applicant: BASE SE
    Inventors: Regina Vogelsang, Stefan Kaeshammer, Wolfgang Staffel, Ulrich Eiden, Alexandra Brand, Lembit Tuttelberg
  • Process for preparing filterable polystyrene dispersion
    Patent number: 5763551
    Abstract: Particulate, filterable polystyrene formulations are obtained by anionic polymerization of styrene in nonaqueous dispersion if the polymerization is carried out in an aliphatic hydrocarbon as the dispersing medium and with a styrene/diene/styrene three-block copolymer, for example based on polybutadiene or polyisoprene, as the dispersant.
    Type: Grant
    Filed: August 26, 1997
    Date of Patent: June 9, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Josef Wunsch, Lembit Tuttelberg, Fritz Heinrich, Siegbert Brand