Patents by Inventor Marvin S. Hoekstra

Marvin S. Hoekstra 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).

  • Bevantolol preparation
    Patent number: 4994618
    Abstract: The preparation of Bevantolol--i.e., 1-[ 3,4-dimethoxyphenethylamine] -3-(m-tolyloxy)-2-propanol--is facilitated by contacting the reactants at relatively low temperatures.
    Type: Grant
    Filed: September 9, 1988
    Date of Patent: February 19, 1991
    Assignee: Warner-Lambert Company
    Inventor: Marvin S. Hoekstra
  • Process for the preparation of dihydro-1H-pyrrolizine-3,5-(2H,6H)-dione
    Patent number: 4663464
    Abstract: Dihydro-1H-pyrrolizine-3,5-(2H,6H)-dione is produced in higher overall yield in a process which comprises catalytically hydrogenating a lower alkyl ester of 4-(hydroxyimino)heptanedioic acid in the presence of a tri-(lower alkyl)amine, followed by cyclization of the product thus produced in the presence of a cyclizing agent such as acetic anhydride.
    Type: Grant
    Filed: March 21, 1986
    Date of Patent: May 5, 1987
    Assignee: Warner-Lambert Company
    Inventor: Marvin S. Hoekstra