Patents by Inventor Rolf Wehrmann

Rolf Wehrmann 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).

  • Polycarbonates, polyester carbonates and polyesters with special branched terminal groups
    Patent number: 6825312
    Abstract: A phenolic compound having a branched structure is disclosed. The compound conforms to HO—Ar1—X—Ar2—[Y—W]n  (1) wherein Ar1 and Ar2 independently denote an optionally substituted mononuclear or polynuclear aromatic moiety, X and Y independently denote a single bond or a divalent radical, W denotes an optionally substituted mononuclear or polynuclear aromatic moiety or an aliphatic or cycloaliphatic radical, and n is 1 to 5, is useful as a terminal group in polycarbonates, polyester carbonates and polyesters. Also disclosed is a process for producing such resins where the disclosed compound is a chain terminator.
    Type: Grant
    Filed: April 22, 2003
    Date of Patent: November 30, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Alexander Meyer, Melanie Moethrath, Werner Heuer Helmut, Rolf Wehrmann, Friedrich-Karl Bruder
  • 3-4-Alkylenedioxythiophene diols, their preparation and use in capacitors
    Publication number: 20040235990
    Abstract: 3,4-Alkylenedioxythiophene derivatives of the formulae I and II 1
    Type: Application
    Filed: March 15, 2004
    Publication date: November 25, 2004
    Inventors: Helmut-Werner Heuer, Rolf Wehrmann
  • Highly branched (co)polycarbonates having improved flowability
    Publication number: 20040220374
    Abstract: A process of preparing a branched (co)polycarbonate resin is disclosed.
    Type: Application
    Filed: April 1, 2004
    Publication date: November 4, 2004
    Inventors: Helmut-Werner Heuer, Rolf Wehrmann, Michael Erkelenz
  • Polycarbonates, polyester carbonates and polyesters having branched terminal groups
    Patent number: 6784278
    Abstract: The use of phenols having a branched structure as terminal groups in polycarbonates, polyester carbonates and polyesters is disclosed. Also disclosed are polycarbonates, polyester carbonates and polyesters having such branched terminal groups, the process for their production and molded parts made therefrom.
    Type: Grant
    Filed: June 11, 2002
    Date of Patent: August 31, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Helmut-Werner Heuer, Rolf Wehrmann, Alexander Meyer, Harald Pielartzik, Friedrich-Karl Bruder, Jos M. J. Paulusse
  • Polycarbonates, polyester carbonates and polyesters having lateral, cycloalkyl-substituted phenols
    Publication number: 20040158025
    Abstract: A process of using of a particularly substituted phenol as a chain terminator of a polymeric resin is disclosed. The chain terminator is a member selected from among ortho-substituted phenol, metha-substituted phenol, and their corresponding coupled esters. The polymeric resin is selected among polycarbonate, polyester carbonate and polyester. The thus chain terminated resin is suitable for producing molded parts and extrudates. Also disclosed are the process for producing these polymers and processes for producing the molded parts and extrudates.
    Type: Application
    Filed: February 5, 2004
    Publication date: August 12, 2004
    Inventors: Friedrich-Karl Bruder, Helmut-Werner Heuer, Alexander Meyer, Rolf Wehrmann
  • Polycarbonates, polyester carbonates and polyesters having lateral, cycloalkyl-substituted phenols
    Publication number: 20040127677
    Abstract: A process of using of a particularly substituted phenol as a chain terminator of a polymeric resin is disclosed. The chain terminator is a member selected from among ortho-substituted phenol, metha-substituted phenol, and their corresponding coupled esters. The polymeric resin is selected among polycarbonate, polyester carbonate and polyester. The thus chain terminated resin is suitable for producing molded parts and extrudates. Also disclosed are the process for producing these polymers and processes for producing the molded parts and extrudates.
    Type: Application
    Filed: October 17, 2003
    Publication date: July 1, 2004
    Inventors: Friedrich-Karl Bruder, Helmut-Werner Heuer, Alexander Meyer, Rolf Wehrmann
  • Production of polyester carbonates
    Patent number: 6734278
    Abstract: The present invention provides a two-stage process for the production of polyester carbonates with aliphatic dicarboxylic acids, the polyester carbonates obtained thereby, a process for the production of extrudates and molded articles from the polyester carbonates, and the extrudates and molded articles obtained thereby.
    Type: Grant
    Filed: October 2, 2002
    Date of Patent: May 11, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Silke Kratschmer, Wolfgang Alewelt, Friedrich-Karl Bruder, Wilfried Haese, Rolf Wehrmann, Peter Fischer, Marco Roelofs, Lothar Bunzel
  • Polyester polycarbonates of particular diphenols
    Patent number: 6696543
    Abstract: Polyestercarbonate resin is disclosed having a molecular structure that contains units derived from dicarboxylic acids and units derived from at least one diphenol selected from the group consisting of formula (IIa) and (IIb) in which R1 to R7 each independently of the others represents hydrogen, halogen, a C1- to C12-alkyl radical, a C6- to C19-aryl radical, a C7- to C12-aralkyl radical. Also disclosed are the processes for their preparation, and their use in the production of molded articles and extrudates.
    Type: Grant
    Filed: August 20, 2002
    Date of Patent: February 24, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Wehrmann, Helmut-Werner Heuer
  • Polycarbonates, polyester carbonates and polyesters with special branched terminal groups
    Publication number: 20040030090
    Abstract: A phenolic compound having a branched structure is disclosed.
    Type: Application
    Filed: April 22, 2003
    Publication date: February 12, 2004
    Inventors: Alexander Meyer, Melanie Moethrath, Werner Heuer Helmut, Rolf Wehrmann, Friedrich-Karl Bruder
  • Polynuclear metal complexes as phosphorescence emitters in electroluminescent layer arrangements
    Publication number: 20040026663
    Abstract: The present invention relates to polynuclear metal complexes, a process for their preparation and their use as phosphorescence emitters in electroluminescent layer arrangements.
    Type: Application
    Filed: August 6, 2003
    Publication date: February 12, 2004
    Inventors: Helmut-Werner Heuer, Rolf Wehrmann, Armin Sautter
  • Use of copolycarbonates
    Patent number: 6646101
    Abstract: The present invention provides the use of impact resistant, stress cracking resistant copolycarbonates with particularly good low temperature properties for applications in which particularly good low temperature properties are required, e.g., for automobile construction or external applications, and new copolycarbonates themselves.
    Type: Grant
    Filed: November 8, 2002
    Date of Patent: November 11, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Silke Kratschmer, Klaus Horn, Annett König, Rolf Wehrmann, Steffen Kühling
  • Production of polyester carbonates
    Publication number: 20030139564
    Abstract: The present invention provides a two-stage process for the production of polyester carbonates with aliphatic dicarboxylic acids, the polyester carbonates obtained thereby, a process for the production of extrudates and molded articles from the polyester carbonates, and the extrudates and molded articles obtained thereby.
    Type: Application
    Filed: October 2, 2002
    Publication date: July 24, 2003
    Inventors: Silke Kratschmer, Wolfgang Alewelt, Friedrich-Karl Bruder, Wilfried Haese, Rolf Wehrmann, Peter Fischer, Marco Roelofs, Lothar Bunzel
  • Fluorescent, structured shaped bodies
    Patent number: 6584714
    Abstract: Optical display containing one or more shaped articles and a light source. The shaped articles consist of a transparent or semitransparent plastic. The plastic contains one or more fluorescent substances. One or more light sources are arranged in such a way that their light is applied to the surface of the shaped article at particular regions of it and propagates through the shaped article. The shaped article contains means for controlled light output, so that the light can be output from the shaped article in a controlled way at quite particular regions on the surface of the shaped article.
    Type: Grant
    Filed: May 15, 2001
    Date of Patent: July 1, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Wehrmann, Helmut-Werner Heuer
  • Use of copolycarbonates
    Patent number: 6586556
    Abstract: The present invention provides the use of impact resistant, stress cracking resistant copolycarbonates with particularly good low temperature properties for applications in which particularly good low temperature properties are required, e.g., for automobile construction or external applications, and new copolycarbonates themselves.
    Type: Grant
    Filed: September 24, 2001
    Date of Patent: July 1, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Silke Kratschmer, Klaus Horn, Annett König, Rolf Wehrmann, Steffen Kühling
  • Polyester polycarbonates of particular diphenols
    Publication number: 20030120024
    Abstract: Polyestercarbonate resin is disclosed having a molecular structure that contains units derived from dicarboxylic acids and units derived from at least one diphenol selected from the group consisting of formula (IIa) and (IIb) 1
    Type: Application
    Filed: August 20, 2002
    Publication date: June 26, 2003
    Inventors: Rolf Wehrmann, Helmut-Werner Heuer
  • Electrophosphorescent arrangement comprising conductive polymers
    Publication number: 20030108769
    Abstract: The invention relates to layer arrangement having (i) at least one transparent substrate containing an electrically conductive layer, (ii) an electro-optically active layer, and (iii) a further substrate containing an electrically conductive layer, wherein at least one of the two electrically conductive substrates is additionally coated with an organic conductive polymer system and the electro-optically active layer contains an electrophosphorescent compound.
    Type: Application
    Filed: September 20, 2002
    Publication date: June 12, 2003
    Inventors: Helmut-Werner Heuer, Rolf Wehrmann
  • Plastic substrate for solid-state laser
    Patent number: 6577657
    Abstract: A substrate (1) for a solid-state laser based on organic and/or inorganic laser material, and a solid-state laser are described, in which the substrate (1) consists of thermoplastic or thermoset and is structured on at least one surface (8), the structured surface (8) of the substrate (1) having a periodic surface profile (9).
    Type: Grant
    Filed: March 3, 1999
    Date of Patent: June 10, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Andreas Elschner, Friedrich-Karl Bruder, Rolf Wehrmann, Rainer Friedbert Mahrt, Ullrich Scherf
  • Polyester carbonate and a data carrier therefrom
    Publication number: 20030104234
    Abstract: A copolyester carbonate especially suitable for the preparation of machine readable data carriers is disclosed.
    Type: Application
    Filed: September 18, 2002
    Publication date: June 5, 2003
    Inventors: Friedrich-Karl Bruder, Wilfried Haese, Rolf Wehrmann, Peter Fischer, Marco Roelofs, Silke Kratschmer
  • Polycarbonates, polyester carbonates and polyesters having branched terminal groups
    Publication number: 20030096941
    Abstract: The use of phenols having a branched structure as terminal groups in polycarbonates, polyester carbonates and polyesters is disclosed. Also disclosed are polycarbonates, polyester carbonates and polyesters having such branched terminal groups, the process for their production and molded parts made therefrom.
    Type: Application
    Filed: June 11, 2002
    Publication date: May 22, 2003
    Inventors: Helmut-Werner Heuer, Rolf Wehrmann, Alexander Meyer, Harald Pielartzik, Friedrich-Karl Bruder, Jos M.J. Paulusse
  • Use of copolycarbonates
    Publication number: 20030092873
    Abstract: The present invention provides the use of impact resistant, stress cracking resistant copolycarbonates with particularly good low temperature properties for applications in which particularly good low temperature properties are required, e.g., for automobile construction or external applications, and new copolycarbonates themselves.
    Type: Application
    Filed: November 8, 2002
    Publication date: May 15, 2003
    Inventors: Silke Kratschmer, Klaus Horn, Annett Konig, Rolf Wehrmann, Steffen Kuhling