Patents by Inventor Erich Hammerschmidt

Erich Hammerschmidt 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).

  • Process for preparing piperidines
    Patent number: 6458954
    Abstract: Piperidines are prepared in an advantageous manner by catalytic hydrogenation of activated pyridines in the presence of palladium catalysts if the palladium catalyst is palladium-on-carbon and the solvents are aromatic hydrocarbons.
    Type: Grant
    Filed: April 30, 2001
    Date of Patent: October 1, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Guido Giffels, Herbert Diehl, Georg Martin, Lutz Frohn, Erich Hammerschmidt
  • Process for preparing basic organic nitrogen-containing compounds by reduction with lithium aluminum hydride
    Publication number: 20020016462
    Abstract: This invention relates to a process for preparing basic organic nitrogen-containing compounds by
    Type: Application
    Filed: July 25, 2001
    Publication date: February 7, 2002
    Inventors: Johannes Scherer, Gunter Rauchschwalbe, Erich Hammerschmidt, Heinz-Gerd Hartges
  • Process for preparing piperidines
    Publication number: 20010056186
    Abstract: Piperidines are prepared in an advantageous manner by catalytic hydrogenation of activated pyridines in the presence of palladium catalysts if the palladium catalyst is palladium-on-carbon and the solvents are aromatic hydrocarbons.
    Type: Application
    Filed: April 30, 2001
    Publication date: December 27, 2001
    Inventors: Guido Giffels, Herbert Diehl, Georg Martin, Lutz Frohn, Erich Hammerschmidt
  • Process for the preparation of alkyl aryl ethers containing carboxyl groups
    Patent number: 5869735
    Abstract: Process for the preparation of alkyl aryl ethers containing carboxyl groups which are suitable for the preparation of colour film couplers, or derivatives thereof, by reaction of aromatic alcohols with alkyl halides containing carboxyl groups or derivatives thereof and basic alkali metal or alkaline earth metal compounds, characterized in that the reaction is carried out in the melt of the aromatic alcohol.
    Type: Grant
    Filed: October 11, 1996
    Date of Patent: February 9, 1999
    Assignee: Bayer Aktiengesellschaft
    Inventors: Stefan Antons, Erich Hammerschmidt, Heinz Ulrich Blank, Helmut Fiege, Heinz-Gerd Hartges
  • Process for the preparation of 6-hydroxynaphthalene-1-carboxylic from 1-aminomethylnaphthalene-6-sulphonic acid
    Patent number: 4874892
    Abstract: The invention relates to the new compound 1-aminomethylnaphthalene-6-sulphonic acid, a process for its preparation by amidoalkylation of naphthalene-2-sulphonic acid and hydrolysis of the amidoalkylation product, and its use as an intermediate product for the preparation of 6-hydroxynaphthalene-1-carboxylic acid.
    Type: Grant
    Filed: July 18, 1988
    Date of Patent: October 17, 1989
    Assignee: Bayer Aktiengesellschaft
    Inventors: Erich Hammerschmidt, Heinz U. Blank
  • Thermotropic aromatic polymers with high elongation at break, processes for their preparation and their use for the production of moulded articles, filaments, fibres and films
    Patent number: 4835243
    Abstract: Thermotropic, fully aromatic polyesters based on p-hydroxybenzoic acid, aromatic dicarboxylic acid and diphenol in which the dicarboxylic acid groups consist at least in part of 3,3'-diphenyldicarboxylic acid groups have excellent mechanical properties, in particular excellent elongation at break.
    Type: Grant
    Filed: June 13, 1988
    Date of Patent: May 30, 1989
    Inventors: Volker Eckhardt, Hans-Rudolf Dicke, Erich Hammerschmidt, Ludwig Bottenbruch, Frank Kleiner, Heinz-Ulrich Blank
  • Thermotropic aromatic polyesters having a high deflection temperature under load and excellent mechanical properties, a process for their preparation and their use for the production of moldings, filaments, fibres and films
    Patent number: 4806619
    Abstract: Thermotropic, fully-aromatic polyesters having a high content of 3,4'-benzophenonedicarboxylic acid radicals exhibit a combination, hitherto unknown, of good processability, high deflection temperature under load and very high strength and stiffness.
    Type: Grant
    Filed: October 2, 1986
    Date of Patent: February 21, 1989
    Assignee: Bayer Aktiengesellschaft
    Inventors: Volker Eckhardt, Hans-Rudolf Dicke, Erich Hammerschmidt, Dieter Freitag
  • 1-Aminomethylnaphthalene-6-sulphonic acid, its preparation and its use
    Patent number: 4795596
    Abstract: The invention relates to the new compound 1-aminomethylnaphthalene-6-sulphonic acid, a process for its preparation by amidoalkylation of naphthalene-2-sulphonic acid and hydrolysis of the amidoalkylation product, and its use as an intermediate product for the preparation of 6-hydroxynaphthalene-1-carboxylic acid.
    Type: Grant
    Filed: October 15, 1987
    Date of Patent: January 3, 1989
    Assignee: Bayer Aktiengesellschaft
    Inventors: Erich Hammerschmidt, Heinz U. Blank
  • Tetra-alkali metal salts of chromotropic acid, a process for their isolation and their use
    Patent number: 4705652
    Abstract: Solid crystalline tetra-alkali metal salts of chromotropic acid, a process for their isolation and their use for the preparation of pure chromotropic acid or di-alkali metal salts of chromotropic acid.
    Type: Grant
    Filed: May 23, 1986
    Date of Patent: November 10, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Erich Hammerschmidt, Horst Behre, Heinz U. Blank, Dietmar Mayer
  • Process for preparing 1-amino-2-naphthol-4-sulphonic acid (amidol acid)
    Patent number: 4427601
    Abstract: The process for preparing 1-amino-2-naphthol-4-sulphonic acid by acidifying 3-oxo-4-hydroxyimino-1,2,3,4-tetrahydronaphthalene-1-sulphonic acid or its alkali metal salt in the presence of hydrogen sulphite is carried out in the presence of iron ions.
    Type: Grant
    Filed: November 5, 1982
    Date of Patent: January 24, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Erich Hammerschmidt, Horst Behre, Heinz U. Blank, Otto Lindner
  • Process for the preparation of 1-benzoylamino-8-hydroxynaphthalene-4,6-disulphonic acid (benzoyl-K acid)
    Patent number: 4426333
    Abstract: The invention relates to a process for the preparation of 1-benzoylamino-8-hydroxynaphthalene-4,6-disulphonic acid (benzoyl-K acid) by reacting 1-amino-8-hydroxynaphthalene-4,6-disulphonic acid (K acid) with benzoylating agents, according to which process mixtures of aminonaphtholdisulphonic acid isomers are used instead of pure K acid, which mixtures contain over 40% by weight of K acid, relative to the total amount of diazotizable compounds in the mixture of isomers, and in which no other single isomer has a proportion which exceeds 10% by weight of the total amount of diazotizable compounds in the mixture of isomers.
    Type: Grant
    Filed: April 23, 1982
    Date of Patent: January 17, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Erich Hammerschmidt, Horst Behre, Bruno Kruger, Adolf Winkler