Patents by Inventor Harald Medem

Harald Medem 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).

  • Supported hydrogenation catalysts
    Patent number: 4774221
    Abstract: Supported catalysts containing palladium on a support material are improved by added bases which remain on the material. These supported catalysts are useful for hydrogenating optionally substituted phenols to give the corresponding cyclohexanols as the predominant product.
    Type: Grant
    Filed: October 20, 1986
    Date of Patent: September 27, 1988
    Assignee: Bayer Aktiengesellschaft
    Inventors: Harald Medem, Udo Birkenstock, Herbert Schmidt, Burkhard Lachmann
  • Process for the regeneration of catalysts for the gas-phase reduction of aromatic nitro compounds
    Patent number: 4714689
    Abstract: Catalysts for the gas-phase reduction of aromatic nitro compounds to aromatic amines are regenerated by treatment of the catalyst, at elevated temperature, with a gas mixture which contains oxygen, inorganic and/or organic amines and/or nitrogen oxides and, where appropiate, steam.
    Type: Grant
    Filed: August 7, 1986
    Date of Patent: December 22, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gunter Stammann, Zoltan Kricsfalussy, Helmut Waldmann, Joachim Schneider, Harald Medem
  • Thermoplastic polycarbonates, their preparation and their use as shaped articles and films
    Patent number: 4506066
    Abstract: The present invention relates to high molecular weight thermoplastic hexahydro-furo-(3,2-b)-furane-3,6-diol based copolycarbonates useful as molding resins and to a method for their preparation.
    Type: Grant
    Filed: April 13, 1983
    Date of Patent: March 19, 1985
    Assignee: Bayer Aktiengesellschaft
    Inventors: Harald Medem, Manfred Schreckenberg, Rolf Dhein, Werner Nouvertne, Hans Rudolph
  • Mixtures of polycarbonate elastomers, containing hydrogenated dimeric fatty acid esters as condensed units, and polyolefines and, optionally, other polycarbonates
    Patent number: 4435544
    Abstract: The present invention relates to mixtures of polycarbonates containing hydrogenated dimeric fatty acid esters as condensed units, and polyolefines and, if appropriate, other high-molecular weight, aromatic thermoplastic polycarbonates.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: March 6, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Manfred Schreckenberg, Werner Nouvertne, Harald Medem, Rolf Dhein, Peter R. Muller
  • Process for the preparation of aromatic polyesters and the use thereof for the production of injection molded articles, films and coatings
    Patent number: 4334053
    Abstract: Aromatic polyesters based on diphenols, terephthalic and isophthalic acid and particular chain terminators exhibit an improved color number, an improved flowability and increased dimensional heat stability with otherwise comparable mechanical characteristics.
    Type: Grant
    Filed: September 29, 1980
    Date of Patent: June 8, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Dieter Freitag, Klaus Reinking, Karsten Idel, Harald Medem, Ludwig Bottenbruch
  • Aromatic polyester phosphonates
    Patent number: 4328174
    Abstract: Polyester phosphonates based on aromatic dicarboxylic acids and aromatic dihydroxy compounds exhibit a low flammability and surprisingly improved mechanical characteristics, particularly an excellent dimensional heat stability.
    Type: Grant
    Filed: June 19, 1980
    Date of Patent: May 4, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Manfred Schmidt, Dieter Freitag, Ludwig Bottenbruch, Klaus Reinking, Harry Rohr, Harald Medem
  • Process for the preparation of aromatic polyesters
    Patent number: 4260695
    Abstract: High-molecular polyesters which are distinguished by good processability, a high glass transition temperature, mechanical strength and clear transparency are reproducibly obtained by transesterifying and polycondensing bisphenols with diaryl terephthalates and/or diaryl isophthalates in the presence of an aromatic polycarbonate having a molecular weight of 600 to 15,000.
    Type: Grant
    Filed: November 24, 1978
    Date of Patent: April 7, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Harald Medem, Dieter Freitag, Klaus Reinking
  • Optical components consisting of aromatic polyesters molded in the form of an optical lens
    Patent number: 4225698
    Abstract: Thermoplastic aromatic polyesters comprising cocondensed bisphenol residues generally have a refractive index n.sub.d of from 1.60 to 1.66, an Abbe coefficient v.sub.d of from 27 to 21 and a color triplet of about 5.1, 0.1, O and are excellent starting materials for the production of optical components, particularly high quality lenses for still and cine cameras.
    Type: Grant
    Filed: January 19, 1979
    Date of Patent: September 30, 1980
    Assignee: Bayer Aktiengesellschaft
    Inventors: Harald Medem, Dieter Freitag, Hans Hespe, Carl Heynemann