Patents by Inventor Bjoern Wechsler

Bjoern Wechsler 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 producing 6-chlorodibenzo[D,F] [1,3,2] dioxaphosphepin
    Patent number: 9290527
    Abstract: The invention relates to a method for producing 6-chlorodibenzo[d,f][1,3,2]-dioxaphosphepin (formula 1), comprising the following steps: a) addition of 2,2?-dihydroxybiphenyl, which is suspended in an inert solvant. into a reactor to an excess of phosphorous trichloride under inert gas and stirring; b) discharge and neutralization of the resulting gases from the reaction mixture; c) separation of the excess phosphorous trichloride and the solvant; d) obtention of 6-chlorodibenzo[d,f][1,3,2]-dioxaphosphepin.
    Type: Grant
    Filed: March 19, 2014
    Date of Patent: March 22, 2016
    Assignee: EVONIK DEGUSSA GMBH
    Inventors: Dirk Fridag, Robert Franke, Bernhard Schemmer, Burkard Kreidler, Bjoern Wechsler
  • Method for the preparation of biphephos
    Patent number: 9127030
    Abstract: The invention relates to a process for producing 6,6?-[(3,3?-di-tert-butyl-5,5?-dimethoxy-1,1?-biphenyl-2,2?diyl)bis(oxy)]bis(dibenzo[d,f][1,3,2]dioxaphosphepine), abbreviated to biphephos (see formula 1), with low chlorine content.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: September 8, 2015
    Assignee: EVONIK DEGUSSA GmbH
    Inventors: Burkard Kreidler, Dirk Fridag, Bernhard Schemmer, Bjoern Wechsler, Andrea Christiansen, Doris Neumann
  • METHOD FOR PRODUCING 6-CHLORODIBENZO[D,F] [1,3,2] DIOXAPHOSPHEPIN
    Publication number: 20140206904
    Abstract: The invention relates to a method for producing 6-chlorodibenzo[d,f] [1,3,2]-dioxaphosphepin (formula 1), comprising the following steps: a) addition of 2,2?-dihydroxybiphenyl, which is suspended in an inert solvant. into a reactor to an excess of phosphorous trichloride under inert gas and stirring; b) discharge and neutralization of the resulting gases from the reaction mixture; c) separation of the excess phosphorous trichloride and the solvant; d) obtention of 6-chlorodibenzo[d,f] [1,3,2]-dioxaphosphepin.
    Type: Application
    Filed: March 19, 2014
    Publication date: July 24, 2014
    Applicant: EVONIK OXENO GMBH
    Inventors: DIRK FRIDAG, ROBERT FRANKE, BERNHARD SCHEMMER, BURKARD KREIDLER, BJOERN WECHSLER
  • Method for producing 6-chlorodibenzo[d,f] [1,3,2]-dioxaphosphepin
    Patent number: 8729287
    Abstract: The invention relates to a method for producing 6-chlorodibenzo[d,f][1,3,2]dioxaphosphepin (formula 1), comprising the following steps: a) addition of 2,2?-dihydroxybiphenyl, which is suspended in an inert solvant. into a reactor to an excess of phosphorous trichloride under inert gas and stirring; b) discharge and neutralization of the resulting gases from the reaction mixture; c) separation of the excess phosphorous trichloride and the solvant; d) obtention of 6-chlorodibenzo[d,f][1,3,2]dioxaphosphepin.
    Type: Grant
    Filed: October 9, 2009
    Date of Patent: May 20, 2014
    Assignee: Evonik Oxeno GmbH
    Inventors: Dirk Fridag, Robert Franke, Bernhard Schemmer, Burkard Kreidler, Bjoern Wechsler
  • Method for producing 6-chlorodibenzo[D,F] [1 3,2]Dioxaphosphepin
    Patent number: 8609878
    Abstract: The invention relates to a method for producing 6-chlorodibenzo[d,f][1,3,2]-dioxaphosphepin (formula 1), comprising the following steps: a) addition of liquid 2,2?-dihydroxybiphenyl into a reactor to an excess of phosphorous trichloride under inert gas and stirring; b) discharge and neutralization of the resulting gases from the reaction mixture; c) separation of the excess phosphorous trichloride; d) obtention of 6-chlorodibenzo[d,f][1,3,2]-dioxaphosphepin.
    Type: Grant
    Filed: October 9, 2009
    Date of Patent: December 17, 2013
    Assignee: Evonik Oxeno GmbH
    Inventors: Dirk Fridag, Robert Franke, Bernhard Schemmer, Burkard Kreidler, Bjoern Wechsler
  • METHOD FOR THE PREPARATION OF BIPHEPHOS
    Publication number: 20130324756
    Abstract: The invention relates to a process for producing 6,6?-[(3,3?-di-tert-butyl-5,5?-dimethoxy-1,1?-biphenyl-2,2?diyl)bis(oxy)]bis(dibenzo[d,f][1,3,2]dioxaphosphepine), abbreviated to biphephos (see formula 1), with low chlorine content
    Type: Application
    Filed: December 22, 2011
    Publication date: December 5, 2013
    Applicant: Evonik Oxeno GmbH
    Inventors: Burkard Kreidler, Dirk Fridag, Bernhard Schemmer, Bjoern Wechsler, Andrea Christiansen, Doris Neumann
  • METHOD FOR THE PURIFICATION OF BIPHEPHOS
    Publication number: 20130317246
    Abstract: The invention relates to a process for the purification of 6,6?-[(3,3?-di-tert-butyl-5,5?-dimethoxy-1,1?-biphenyl-2,2?diyl)bis(oxy)]bis(dibenzo[d,f][1,3,2]dioxaphosphepin), abbreviation: biphephos (see formula 1).
    Type: Application
    Filed: December 22, 2011
    Publication date: November 28, 2013
    Applicant: Evonik Oxeno GmbH
    Inventors: Burkard Kreidler, Dirk Fridag, Bernhard Schemmer, Bjoern Wechsler, Andrea Christiansen, Doris Neumann
  • METHOD FOR PRODUCING 6-CHLORODIBENZO[D,F] [1,3,2]-DIOXAPHOSPHEPIN
    Publication number: 20110207966
    Abstract: The invention relates to a method for producing 6-chlorodibenzo[d,f][1,3,2]dioxaphosphepin (formula 1), comprising the following steps: a) addition of 2,2?-dihydroxybiphenyl, which is suspended in an inert solvant. into a reactor to an excess of phosphorous trichloride under inert gas and stirring; b) discharge and neutralization of the resulting gases from the reaction mixture; c) separation of the excess phosphorous trichloride and the solvant; d) obtention of 6-chlorodibenzo[d,f][1,3,2]dioxaphosphepin.
    Type: Application
    Filed: October 9, 2009
    Publication date: August 25, 2011
    Applicant: Evonik Oxeno GmbH
    Inventors: Dirk Fridag, Robert Franke, Bernhard Schemmer, Burkard Kreidler, Bjoern Wechsler
  • METHOD FOR PRODUCING 6-CHLORODIBENZO[D,F] [1,3,2]DIOXAPHOSPHEPIN
    Publication number: 20110201837
    Abstract: The invention relates to a method for producing 6-chlorodibenzo[d,f] [1,3,2]-dioxaphosphepin (formula 1), comprising the following steps: a) addition of liquid 2,2?-dihydroxybiphenyl into a reactor to an excess of phosphorous trichloride under inert gas and stirring; b) discharge and neutralization of the resulting gases from the reaction mixture; c) separation of the excess phosphorous trichloride; d) obtention of 6-chlorodibenzo[d,f] [1,3,2]-dioxaphosphepin.
    Type: Application
    Filed: October 9, 2009
    Publication date: August 18, 2011
    Applicant: Evonik Oxeno GmbH
    Inventors: Dirk Fridag, Robert Franke, Bernhard Schemmer, Burkard Kreidler, Bjoern Wechsler