Patents by Inventor Ralf Dujardin

Ralf Dujardin 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).

  • Patent number: 6455059
    Abstract: Molding compositions comprising polyether block amide and homogeneously distributed antimicrobially active substances are disclosed. The compositions are suitable for molding a variety of articles, notably medical articles.
    Type: Grant
    Filed: May 7, 2001
    Date of Patent: September 24, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhard Albers, Ralf Dujardin, Heinz Pudleiner, Joachim Simon, Joachim Wagner, Hartwin Hobler
  • Patent number: 6403239
    Abstract: This invention relates to (co)polymers which contain at least one repeat chain unit of the general formula (1) or (2) and optionally contain repeat units of the general formula (3) in which L1 and L2 mean a photoluminescent residue, wherein the proportion of structural units of the formulae (1) and/or (2) is in each case 0.5 to 100 mol. %, and (3) 0 to 99.5 mol. %, and the molar percentages add up to 100, to the use thereof for the production of electroluminescent devices and to the electroluminescent devices.
    Type: Grant
    Filed: May 8, 2001
    Date of Patent: June 11, 2002
    Assignee: Bayer AG
    Inventors: Yun Chen, Rolf Wehrmann, Andreas Elschner, Ralf Dujardin
  • Patent number: 6365694
    Abstract: Amorphous polymers, including homopolymers and co-polymers, containing residues of vinyl cyclohexane and/or substituted vinyl cyclohexane are described. The polymers of the present invention have a syndiotactic configuration in which the quantity of diads is greater than 50.1% and less than 74%. The polymers of the invention have high transparency, low birefringence and high heat defection temperature, and can be used to prepare molded articles (e.g., optical data storage media and lenses) and films.
    Type: Grant
    Filed: August 8, 2000
    Date of Patent: April 2, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Volker Wege, Ralf Dujardin, Yun Chen, Johann Rechner, Friedrich-Karl Bruder
  • Patent number: 6309755
    Abstract: A process and panel for fixed automotive glazing, the panel molded from polycarbonate, a UV radiation blocking hard coat deposited thereon, and a pigmented primer applied in a defined band extending about the perimeter. The hard coat protects the pigmented primer coating so that two separate coatings are not required.
    Type: Grant
    Filed: February 7, 2000
    Date of Patent: October 30, 2001
    Assignee: Exatec, LLC.
    Inventors: Mark M. Matsco, Eric F. J. M. van der Meulen, Ralf Dujardin
  • Publication number: 20010026879
    Abstract: This invention relates to (co)polymers which contain at least one repeat chain unit of the general formula (1) or (2) and optionally contain repeat units of the general formula (3) 1
    Type: Application
    Filed: May 8, 2001
    Publication date: October 4, 2001
    Inventors: Yun Chen, Rolf Wehrmann, Andreas Elschner, Ralf Dujardin
  • Patent number: 6296865
    Abstract: The present invention relates to insecticidal compositions based on polymers, processes for their preparation and their use for controlling insects which occur in interior rooms.
    Type: Grant
    Filed: August 7, 1998
    Date of Patent: October 2, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Ralf Dujardin, Mike-Dirk Bublitz, Hermann Neumann
  • Patent number: 6248457
    Abstract: This invention relates to (co)polymers which contain at least one repeat chain unit of the general formula (1) or (2) and optionally contain repeat units of the general formula (3) in which L1 and L2 mean a photoluminescent residue, wherein the proportion of structural units of the formulae (1) and/or (2) is in each case 0.5 to 100 mol. %, and (3) 0 to 99.5 mol. %, and the molar percentages add up to 100, to the use thereof for the production of electroluminescent devices and to the electroluminescent devices.
    Type: Grant
    Filed: February 9, 1996
    Date of Patent: June 19, 2001
    Assignee: Bayer AG
    Inventors: Yun Chen, Rolf Wehrmann, Andreas Elschner, Ralf Dujardin
  • Patent number: 6150489
    Abstract: This invention relates to thermoplastic polyurethanes (TPUs) which contain pharmaceutical active ingredients in a homogeneous distribution, to a method of producing them, and to their use in medical articles. During the production of the TPUs, compounds having an antithrombotic or antibacterial effect are added to the monomer mixture.
    Type: Grant
    Filed: March 12, 1999
    Date of Patent: November 21, 2000
    Assignee: Bayer Aktiengesellschaft
    Inventors: Heinz Pudleiner, Ralf Dujardin, Hartwin Hobler
  • Patent number: 6114463
    Abstract: The present invention relates to (co)polymers which contain at least one repeating structural chain unit of the general formula (1) and/or (2) and optionally repeating units of the general formula (3) ##STR1## in which L.sup.1 and L.sup.2, independently of each other, represent a photoluminescent grouping, a process for their preparation, their use in electroluminescent devices and the electroluminescent devices.
    Type: Grant
    Filed: August 11, 1997
    Date of Patent: September 5, 2000
    Assignee: Bayer AG
    Inventors: Yun Chen, Burkhard Kohler, Rolf Wehrmann, Andreas Elschner, Ralf Dujardin
  • Patent number: 6083635
    Abstract: Mixtures ofA) neutral polythiophenes of formula (I), ##STR1## wherein R.sub.1 and R.sub.2 separately from one another represent hydrogen or a C.sub.1-4 alkyl group or together form an optionally substituted C.sub.1-4 alkylene radical, preferably a methylene radical optionally substituted by alkyl groups, an ethylene-1,2 radical optionally substituted by C-.sub.1-12 alkyl or phenyl groups, or a cyclohexylene-1,2 radical, andB) organic compounds containing dihydroxy or polyhydroxy and/or carboxyl groups or amide groups or lactam groups,as well as transparent, electrically conducting coatings made therefrom and electroluminescent systems containing a conductive layer produced from the abovementioned mixtures as the electrode.
    Type: Grant
    Filed: March 19, 1998
    Date of Patent: July 4, 2000
    Assignee: Bayer AG
    Inventors: Friedrich Jonas, Alexander Karbach, Bavo Muys, Etienne van Thillo, Rolf Wehrmann, Andreas Elschner, Ralf Dujardin
  • Patent number: 6075106
    Abstract: The present invention relates to (co)polymers which contain at least one repeat chain unit selected from the group comprising the general formula (1) and (2) and optionally (3), ##STR1## in which L.sup.1 and L.sup.2 mutually independently mean a photoluminescent residue.
    Type: Grant
    Filed: August 27, 1996
    Date of Patent: June 13, 2000
    Assignee: D-51368 Bayer AG
    Inventors: Yun Chen, Burkhard Kohler, Rolf Wehrmann, Andreas Elschner, Ralf Dujardin
  • Patent number: 5990246
    Abstract: Hydrogenation products of copolymers prepared by ring-opening metathetical polymerisation of a cyano-substituted norbornene and at least one multicyclic olefin, which contains 95.5 to 5 wt. % of the cyano-substituted norbornene incorporated in the polymer and in which at least 60% of the initially present olefinic double bonds have been saturated by hydrogenation and the preparation of the new hydrogenation products by polymerisation in the presence of a catalyst and optionally a chain transfer agent at -20.degree. C. to 100.degree. C. at atmospheric pressure in an inert solvent, followed by hydrogenation in the presence of a homogeneous or heterogeneous hydrogenation catalyst at 0.degree. C. to 200.degree. C. under a hydrogen pressure of 2 to 200 bar in an inert solvent.
    Type: Grant
    Filed: December 16, 1997
    Date of Patent: November 23, 1999
    Assignee: Bayer AG
    Inventors: Yun Chen, Ralf Dujardin, Friedrich-Karl Bruder, Johann Rechner
  • Patent number: 5932664
    Abstract: Process for the production of hydrogenated, ring-opened metathesis (co)polymers from cyclic olefins using the ruthenium-carbene complexes of the general formula (I) ##STR1## in which R.sub.1 and R.sub.2 mutually independently mean hydrogen, C.sub.2 -C.sub.20 alkenyl, C.sub.1 -C.sub.20 alkyl, aryl, C.sub.1 -C.sub.20 carboxylate, C.sub.1 -C.sub.20 alkoxy, C.sub.2 -C.sub.20 alkenyloxy, aryloxy, C.sub.2 -C.sub.20 alkoxycarbon-yl,C.sub.1 -C.sub.20 alkylthio, which may optionally be substituted by C.sub.1 -C.sub.5 alkyl, halogen, C.sub.1 -C.sub.5 alkoxy or by phenyl optionally substituted by C.sub.1 -C.sub.5 alkyl, halogen, C.sub.1 -C.sub.5 alkoxy;X.sub.1 and X.sub.2 mutually independently mean any desired anionic ligand;L.sub.1 and L.sub.2 mutually independently mean any desired neutral electron donorand two or three of X.sub.1, X.sub.2, L.sub.1 and L.sub.
    Type: Grant
    Filed: December 16, 1997
    Date of Patent: August 3, 1999
    Assignee: Bayer AG
    Inventors: Yun Chen, Ralf Dujardin, Harald Pielartzik, Uli Werner Franz
  • Patent number: 5905128
    Abstract: This invention relates to (co)polymers which contain at least one repeat chain unit of the general formula (1) or (2) and optionally repeat units of the general formula (3), ##STR1## in which L.sup.1 and L.sup.2 denote a photoluminescent residue,wherein the proportion of structural units of the formulae (1) and/or (2) is in each case 0.5 to 100 mol. % and of (3) is 0 to 99.5 mol. % and the molar percentages add up to 100,to the use thereof for the production of electroluminescent arrangements and to the electroluminescent arrangements.
    Type: Grant
    Filed: May 19, 1998
    Date of Patent: May 18, 1999
    Assignee: Bayer AG
    Inventors: Yun Chen, Rolf Wehrmann, Andreas Elschner, Ralf Dujardin
  • Patent number: 5891975
    Abstract: The present invention relates to (co)polymers which contain at least one repeat chain unit of the general formula (1) or (2) and optionally repeat units of the general formula (3), ##STR1## in which L.sup.1 and L.sup.2 mutually independently mean a photoluminescent residue, to a process for the production thereof, to the use thereof in electroluminescent devices and to the electroluminescent devices.
    Type: Grant
    Filed: March 20, 1996
    Date of Patent: April 6, 1999
    Assignee: Bayer Aktiengesellschaft
    Inventors: Yun Chen, Burkhard Kohler, Rolf Wehrmann, Andreas Elschner, Ralf Dujardin
  • Patent number: 5874180
    Abstract: The invention relates to electroluminescent arrangements (layers) containing special styrenes and to their use.
    Type: Grant
    Filed: October 9, 1997
    Date of Patent: February 23, 1999
    Assignee: Bayer AG
    Inventors: Rolf Wehrmann, Andreas Elschner, Siegfried Thurm, Hans Jurgen Rosenkranz, Ralf Dujardin
  • Patent number: 5861471
    Abstract: The invention relates to polysulphone/polyether block copolycondensates having the recurring structural unit as in formula (I)--(--O--E--O--Ar.sup.1 --SO.sub.2 --Ar.sup.2 --)--W-- (I)whereinE is a divalent diphenolate radical andW is a polyether, polythioether or polyacetal possessing at least two hydroxyl groups and having an average molecular weight (M.sub.n) of from 400 to 30,000 andwherein the proportion of the radical W in the total polymer amounts to 5 to 99 wt. %,the preparation and use thereof for the production of moulded shapes, for example, membranes or catheter tubes.
    Type: Grant
    Filed: April 15, 1996
    Date of Patent: January 19, 1999
    Assignee: Bayer AC
    Inventors: Heinz Pudleiner, Ralf Dujardin, Rolf Wehrmann, Knud Reuter, Helmut-Martin Meier
  • Patent number: 5807945
    Abstract: This invention relates to (co)polymers which contain at least one repeat chain unit of the general formula (1) or (2) and optionally repeat units of the general formula (3), ##STR1## in which L.sup.1 and L.sup.2 denote a photoluminescent residue,wherein the proportion of structural units of the formulae (1) and/or (2) is in each case 0.5 to 100 mol. % and of (3) is 0 to 99.5 mol. % and the molar percentages add up to 100,to the use thereof for the production of electroluminescent arrangements and to the electroluminescent arrangements.
    Type: Grant
    Filed: September 23, 1996
    Date of Patent: September 15, 1998
    Assignee: Bayer AG
    Inventors: Yun Chen, Rolf Wehrmann, Andreas Elschner, Ralf Dujardin
  • Patent number: 5766515
    Abstract: Mixtures ofA) neutral polythiophenes of formula (I), ##STR1## wherein R.sub.1 and R.sub.2 separately from one another represent hydrogen or a C.sub.1-4 alkyl group or together form an optionally substituted C.sub.1-4 alkylene radical, preferably a methylene radical optionally substituted by alkyl groups, an ethylene-1,2 radical optionally substituted by C.sub.1-12 alkyl or phenyl groups, or a cyclohexylene-1,2 radical, andB) organic compounds containing dihydroxy or polyhydroxy and/or carboxyl groups or amide groups or lactam groups,as well as transparent, electrically conducting coatings made therefrom and electroluminescent systems containing a conductive layer produced from the abovementioned mixtures as the electrode.
    Type: Grant
    Filed: May 14, 1997
    Date of Patent: June 16, 1998
    Assignee: Bayer Aktiengessellschaft
    Inventors: Friedrich Jonas, Alexander Karbach, Bavo Muys, Etienne van Thillo, Rolf Wehrmann, Andreas Elschner, Ralf Dujardin
  • Patent number: 5644020
    Abstract: The invention relates to thermoplastically processible aliphatic polyesteramides which are biodegradable (compostable).
    Type: Grant
    Filed: May 10, 1996
    Date of Patent: July 1, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Ralf Timmermann, Ralf Dujardin, Rainhard Koch