Patents by Inventor David Norman Stephens

David Norman Stephens 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).

  • Quinoxaline-carboxylic acid derivatives
    Patent number: 6288065
    Abstract: The disclosure relates to quinoxaline derivates of Formula I wherein R1, R4, R5, R6, R7 and R8 are defined in the disclosure, as well as their production and use in medicinal agents.
    Type: Grant
    Filed: June 23, 1998
    Date of Patent: September 11, 2001
    Assignee: Schering Aktiengeseellschaft
    Inventors: Andreas Huth, Ralph Schmiechen, Ilse Beetz, Ingrid Schumann, Lechoslaw Turski, Peter Andreas Loschmann, David Norman Stephens, Dieter Seidelmann, Martin Kruger, Dieter Rahtz, Peter Holscher
  • Use of quisqualate receptor antagonists
    Patent number: 6191132
    Abstract: The new use of antagonists of the AMPA receptor complex and its physiologically compatible salts as pharmaceutical agents for prevention and treatment of Parkinson's disease as well as pharmaceutical agents, which contain these compounds, is described.
    Type: Grant
    Filed: November 4, 1993
    Date of Patent: February 20, 2001
    Assignee: Schering Aktiengesellschaft
    Inventors: Thomas Klockgether, Peter-Andreas Löschmann, David Norman Stephens, Lechoslaw Turski, Helmut Wachtel
  • Quinoxaline-phosphonic acid derivatives
    Patent number: 6057304
    Abstract: The disclosure relates to quinoxaline derivatives of Formula I ##STR1## wherein R.sup.1, R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 are as defined in the disclosure, as well as their production and use in medicinal agents.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: May 2, 2000
    Assignee: Schering Aktiengesellschaft
    Inventors: Andreas Huth, Ralph Schmiechen, Ilse Beetz, Ingrid Schumann, Lechoslaw Turski, Peter Andreas Loschmann, David Norman Stephens, Dieter Seidelmann, Martin Kruger, Dieter Rahtz, Peter Holscher
  • Hetaryloxy-.beta.-carbolines, their production and use in pharmaceutical agents
    Patent number: 5698555
    Abstract: Hetaryloxy-.beta.-carbolines of formula I ##STR1## in which R.sup.A means a triazine or benzocondensed hetaryl radical with 1-2 nitrogen atoms optionally substituted with halogen, C.sub.1-6 alkyl, C.sub.1-6 alkoxy, C.sub.1-6 alkylthio, trifluoromethyl or SO.sub.2 --R.sup.1 or a 5- or 6-membered hetaryl radical with 1-2 nitrogen atoms substituted with halogen, C.sub.1-6 alkyl, C.sub.1-6 alkoxy, C.sub.1-6 alkylthio, trifluoromethyl or SO.sub.2 --R.sup.1are useful pharmaceutical agents.
    Type: Grant
    Filed: July 11, 1994
    Date of Patent: December 16, 1997
    Assignee: Schering Aktiengesellschaft
    Inventors: Martin Kruger, Andreas Huth, Dieter Seidelmann, Herbert Schneider, Lechoslaw Turski, David Norman Stephens