Patents by Inventor Donald R. Maxwell

Donald R. Maxwell 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).

  • 1-Substituted phenyl-4-alkyl hydantoin piperazine compounds as antihypertensive agents
    Patent number: 4452798
    Abstract: Certain substituted phenylpiperazine compounds useful as antihypertensive agents are described. Methods for their preparation and use are disclosed.
    Type: Grant
    Filed: June 22, 1982
    Date of Patent: June 5, 1984
    Assignee: Warner-Lambert Company
    Inventor: Donald R. Maxwell
  • Anti-depressant methods
    Patent number: 4232021
    Abstract: Pharmaceutical compositions comprising essentially pure trans-9-[3-(4-hydroxyethyl-1-piperazinyl)propylidene]-2-trifluoromethylthi axanthene or pharmaceutically acceptable acid addition salts thereof and a pharmaceutical carrier and methods for treating depression which comprises administering said pharmaceutical compositions.
    Type: Grant
    Filed: January 25, 1979
    Date of Patent: November 4, 1980
    Assignee: Kefalas A/S
    Inventors: Bruno P. H. Poschel, Donald R. Maxwell