Patents by Inventor Gerhard Kretzschmar

Gerhard Kretzschmar 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: 5811405
    Abstract: The invention relates to multiply fucosylated dicarboxylic acid derivatives possessing antiadhesive properties, to a process for preparing them, to their use, and to pharmaceuticals and diagnostic agents which are prepared from these derivatives. These multiply fucosylated dicarboxylic acid derivatives are suitable for preparing pharmaceuticals or diagnostic agents for diseases which are associated with an excessive, selectin receptor-mediated cell adhesion in the tissue which is affected by the disease.
    Type: Grant
    Filed: January 24, 1997
    Date of Patent: September 22, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Alexander Toepfer, Gerhard Kretzschmar, Eckart Bartnik, Christoph Huls, Dirk Seiffge
  • Patent number: 5811539
    Abstract: The present invention relates to an improved process for isolating and purifying sugar nucleotides, in particular cytidine monophosphate-activated N-acetylneuraminic acid (CMP-Nana), from biological sources. The sugar nucleotides can be obtained from a sugar nucleotide-containing solution, which has been freed of proteins by alcoholic precipitation, by means of an improved column-chromatographic method which uses silica gel as the stationary phase, and at a purity level which requires only a subsequent desalting step to obtain a substantially pure product.
    Type: Grant
    Filed: August 30, 1995
    Date of Patent: September 22, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Andreas Seiffert-Stoeriko, Brigitte Hoersch, Ruediger Marquardt, Gerhard Kretzschmar, Johannes Meiwes
  • Patent number: 5780640
    Abstract: Process for the biotechnological preparation of L-thienylalanines in enantiomerically pure form from 2-hydroxy-3-thienylacrylic acids, and their use.L-Thienylalanines are prepared via the hydantoin or the azlactone route. The starting substances used for the biotransformation are 2-hydroxy-3-thienylacrylic acids. The innovative step consists in the transamination of the enol form of the 2-hydroxy-3-thienylacrylic acids to give L-thienylalanines with the aid of biotransformation. The transaminiation is carried out in the presence of L-aspartic acid or L-glutamic acid as amino donor.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: July 14, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gerhard Kretzschmar, Johannes Meiwes, Manfred Schudok, Peter Hammann, Ulrich Lerch, Susanne Grabley
  • Patent number: 5756321
    Abstract: Methods for the enzyme catalyzed acylation of primary and secondary alcohols using an enol ester as the acyl donor are described. The acylation occurs in organic media, and is enantioselective for racemic or prochiral alcohols. The reaction is irreversible, and produces unreactive by-products.
    Type: Grant
    Filed: February 20, 1996
    Date of Patent: May 26, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Manfred Schudok, Gerhard Kretzschmar
  • Patent number: 5739300
    Abstract: The invention relates to conjugates which consist of mono- or polycarboxylated piperidine or pyrrolidine derivatives and pyranoses, furanoses or polyalcohols linked via a chain or a cyclic system. The carboxyl groups of the piperidine derivatives can either be located directly on the ring or linked to the ring via a short chain. The invention additionally relates to the preparation of these compounds and to their use for the production of pharmaceuticals and diagnostics.
    Type: Grant
    Filed: October 4, 1996
    Date of Patent: April 14, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Alexander Toepfer, Gerhard Kretzschmar, Bernward Scholkens, Peter Klemm, Christoph Huls, Dirk Seiffge
  • Patent number: 5696246
    Abstract: A process for the stereospecific synthesis of .beta.-glycosidically linked N-acetylglucosamine derivatives is provided, wherein a protected .alpha.-(N-acetyl-2-amino-2-deoxy)-.beta.-pyranosyl halide is coupled to a glycosyl acceptor using zinc chloride and a 4,4'-dialkoxytriphenylmethyl halide as catalysts.
    Type: Grant
    Filed: May 16, 1996
    Date of Patent: December 9, 1997
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Wolfgang Schmidt, Gerhard Kretzschmar
  • Patent number: 5693621
    Abstract: The invention relates to malonic acid derivatives, which inhibit the binding of selectin to carbohydrate ligands, and pharmaceutical compositions and diagnostic agents containing these derivatives, and methods for using these pharmaceutical compositions and diagnostic agents.
    Type: Grant
    Filed: March 13, 1995
    Date of Patent: December 2, 1997
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Alexander Toepfer, Gerhard Kretzschmar, Eckart Bartnik, Dirk Seiffge
  • Patent number: 5688672
    Abstract: Process for the biotechnological preparation of L-thienylalanines in enantiomerically pure form from 2-hydroxy-3-thienylacrylic acidsL-Thienylalanines are prepared via the hydantoin or the azlactone route. The starting substances used for the biotransformation are 2-hydroxy-3-thienylacrylic acids. The innovative step consists in the transamination of the enol form of the 2-hydroxy-3-thienylacrylic acids to give L-thienylalanines with the aid of biotransformation. The transaminiation is carried out in the presence of L-aspartic acid or L-glutamic acid as amino donor.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: November 18, 1997
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gerhard Kretzschmar, Johannes Meiwes, Manfred Schudok, Peter Hammann, Ulrich Lerch, Susanne Grabley
  • Patent number: 5563050
    Abstract: The invention relates to novel antisense oligonucleotides having the sequences ##STR1## and their mixtures, homologs or modified forms, against HSV 1.
    Type: Grant
    Filed: July 27, 1994
    Date of Patent: October 8, 1996
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Anuschirwan Peyman, Eugen Uhlmann, Matthias Mag, Gerhard Kretzschmar, Matthias Helsberg, Irvin Winkler
  • Patent number: 5480786
    Abstract: L-Thienylalanines are prepared via the hydantoin or the azlactone route. The starting substances used for the biotransformation are 2-hydroxy-3-thienylacrylic acids. The innovative step consists in the transamination of the enol form of the 2-hydroxy-3-thienylacrylic acids to give L-thienylalanines with the aid of biotransformation. The transaminiation is carried out in the presence of L-aspartic acid or L-glutamic acid as amino donor.
    Type: Grant
    Filed: July 29, 1993
    Date of Patent: January 2, 1996
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gerhard Kretzschmar, Johannes Meiwes, Manfred Schudok, Peter Hammann, Ulrich Lerch, Susanne Grabley
  • Patent number: 5470843
    Abstract: Carbohydrate-containing polymers which can have an HLB* of from about 10 to about 20 are disclosed. The compounds comprise a hydrophilic polymer portion, a carbohydrate portion comprising from 1 to about 20 naturally occurring, identical or different, monosaccharide units, at least one bifunctional spacer coupling the carbohydrate portion to the hydrophilic polymer portion, and a potentiator moiety. The potentiator moiety can be is a crosslinking moiety located within the hydrophilic polymer or a hydrophobic, hydrophilic or ionic moiety. Processes for the preparation and use of such polymers are also disclosed.
    Type: Grant
    Filed: December 13, 1993
    Date of Patent: November 28, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Wilhelm Stahl, Michael Ahlers, Axel Walch, Eckhart Bartnik, Gerhard Kretzschmar, Susanne Grabley, Rudolf Schleyerbach
  • Patent number: 5387514
    Abstract: The O-acylation of alcohols is carried out by reacting a vinyl ester or a carboxylic ester with Pseudomonas lipase immobilized on a hydrophobic carrier such as a polystyrene-based carrier. The polystyrene carrier preferably has a surface area of 100-1000 m.sup.2 /g, a pore volume of 25 to 75% and a pore diameter of 25-1200 .ANG.. Crosslinking may be carried out after the lipase is immobilized on the carrier.
    Type: Grant
    Filed: December 28, 1993
    Date of Patent: February 7, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Manfred Schudok, Gerd Fulling, Gerhard Kretzschmar
  • Patent number: 5233029
    Abstract: The invention relates to elaiophylin derivatives of the formula I, II and III ##STR1## in which the substituents R(1), R(2), R(3) and R(3)' have the specified meanings. The compounds have antibacterial and antiviral activity.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: August 3, 1993
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Peter Hammann, Gerhard Kretzschmar
  • Patent number: 5096905
    Abstract: The invention relates to elaiophylin derivatives of the formulae (I), (I'), (III) and (III') ##STR1## in which the C.dbd.C double bonds in the 2,3 and 4,5 position may also be hydrogenated and in which R.sup.1, R.sup.2, R.sup.3, R.sup.4 and X have the meanings indicated. The invention furthermore relates to a process for the preparation of these elaiophylin derivatives, and the use thereof as pharmaceuticals, in particular as anthelmintic pharmaceuticals.
    Type: Grant
    Filed: September 14, 1989
    Date of Patent: March 17, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gerhard Kretzschmar, Peter Hammann, Dieter Duwel, Gerhard Wohner, Rudiger Marquardt, Klaus Kuhlein
  • Patent number: 5011827
    Abstract: The invention relates to elaiophyline derivatives of the formula I ##STR1## in which R.sup.1 and R.sup.1' are identical or different and represent a radical of the formula II/or III ##STR2## in which R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.7 have the meanings given. The invention furthermore relates to a process for the preparation of these elaiophyline derivatives and also the use of the lattere as medicaments, in particular as anthelmintically acting medicaments.
    Type: Grant
    Filed: October 28, 1988
    Date of Patent: April 30, 1991
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gerhard Kretzschmar, Dieter Duwel, Susanne Grabley, Peter Hammann, Gerhard Seibert, Hartmut Voelskow, Carlo Giani
  • Patent number: 4985451
    Abstract: The invention relates to elaiophylin derivatives of the formula I, II and III ##STR1## in which the substituents R(1), R(2), R(3) and R(3)' have the specified meanings. The compounds have antibacterial and antiviral activity.
    Type: Grant
    Filed: September 15, 1989
    Date of Patent: January 15, 1991
    Assignee: Hoeschst Aktiengesellschaft
    Inventors: Peter Hamann, Gerhard Kretzschmar