Patents Assigned to Siemens Axiva GmbH & Co. KG
  • Patent number: 6720441
    Abstract: A process for recovering and purifying substituted benzenesulfonates, by neutralizing a mixture including at least one substituted benzenesulfonate, or at least one corresponding substituted benzenesulfonic acid, and sulfur trioxide, sulfuric acid and/or hydrogen chloride in free or bound form, in an aqueous phase using an alkali metal hydroxide, and purifying it in this aqueous phase, and by subsequently separating the substituted benzenesulfonate(s) from this aqueous phase. The mixture is comminuted into particles having a Sauter mean diameter in the range from 1 &mgr;m to 2 cm, either before or during introduction into this aqueous phase.
    Type: Grant
    Filed: May 24, 2002
    Date of Patent: April 13, 2004
    Assignee: Siemens Axiva GmbH & Co. KG
    Inventors: Rainald Forbert, Thomas Diehl
  • Patent number: 6626971
    Abstract: The invention relates to a method and a device for separating at least two physical areas (1, 2) and for reducing the transmission of air-borne particles between said physical areas so as to protect persons and/or products (26) from said air-borne particles. The persons is located at least partly in the first physical area (1) and the products (26) in the second physical area (2) and at least one flat jet (13) of purified air is used to separate the two areas. The invention is characterized in that at least one low-turbulence displacement air stream (14) of purified air is generated at least in the second physical area (2) near the at least one air jet (13) and said at least one displacement air stream is directed primarily in the same direction as the at least one air jet (13).
    Type: Grant
    Filed: June 22, 2001
    Date of Patent: September 30, 2003
    Assignee: Siemens Axiva GmbH & Co. KG
    Inventors: Rainald Forbert, Lothar Gail, Ekkehard Eigenherr
  • Patent number: 6585176
    Abstract: The invention relates to a process for the comminution of bulk materials comprising synthetic polymers which do not have an elastomeric behavior by mechanical, thermal or electromagnetic loading of the bulk materials, which comprises treating the bulk materials, before and/or during the loading, with oxidants which have a redox potential of greater than 1.5 V or subjecting them to corona, UV or plasma treatment without complete oxidation of the synthetic polymer taking place.
    Type: Grant
    Filed: March 8, 2001
    Date of Patent: July 1, 2003
    Assignee: Siemens Axiva GmbH & Co. KG
    Inventors: Olaf Mientkewitz, Elke Schweers, Ulrich Bauer, Helmut Gursky, Hubert Müller, Raimo Drögemeier
  • Patent number: 6555629
    Abstract: Process and apparatus for the continuous preparation of polymers Two reaction partners (starting materials) are stored in separate reservoirs 2, 3, 4 and 5 and are transported using overpressure via heated heat exchangers 11, 12 into a micromixer 18 by means of control and metering devices 6, 7, which can be metering pumps. In the heat exchangers 11, 12, the starting materials are heated, separately in each case, to the extent that during the mixing operation in the micromixer 18 the required reaction temperature is immediately reached. The polymerization takes place in a downstream tube reactor 20 which consists of tubes 21, 22, 23 which are connected in series.
    Type: Grant
    Filed: November 14, 2000
    Date of Patent: April 29, 2003
    Assignee: Siemens Axiva GmbH & Co. KG
    Inventors: Detlev Pysall, Olaf Wachsen, Thomas Bayer, Stefan Wulf
  • Patent number: 6506928
    Abstract: The invention relates to dendrimeric fullerene derivatives in which the fullerene is linked to at least one dendron, wherein the or each dendron has at least one protic group which imparts water solubility.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: January 14, 2003
    Assignee: Siemens Axiva GmbH & Co. KG
    Inventor: Andreas Hirsch
  • Publication number: 20020193628
    Abstract: A process for recovering and purifying substituted benzenesulfonates, by neutralizing a mixture including at least one substituted benzenesulfonate, or at least one corresponding substituted benzenesulfonic acid, and sulfur trioxide, sulfuric acid and/or hydrogen chloride in free or bound form, in an aqueous phase using an alkali metal hydroxide, and purifying it in this aqueous phase, and by subsequently separating the substituted benzenesulfonate(s) from this aqueous phase. The mixture is comminuted into particles having a Sauter mean diameter in the range from 1 &mgr;m to 2 cm, either before or during introduction into this aqueous phase.
    Type: Application
    Filed: May 24, 2002
    Publication date: December 19, 2002
    Applicant: SIEMENS AXIVA GmbH & CO. KG
    Inventors: Rainald Forbert, Thomas Diehl
  • Patent number: 6437190
    Abstract: A process for preparing aldols by catalytic reaction of aldehydes and/or ketones comprises conducting said reaction in the channels of a microstructured reaction system.
    Type: Grant
    Filed: November 2, 2001
    Date of Patent: August 20, 2002
    Assignee: Siemens Axiva GmbH & Co. KG
    Inventors: Inga Leipprand, Thorsten Lahrs