Patents by Inventor Frank J. Stiefel

Frank J. Stiefel 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).

  • Synthesis of 2-phenyl-1,3-propanediol
    Patent number: 5072056
    Abstract: A novel method of preparing 2-phenyl substituted-1, 3-propanediols, useful intermediates in the synthesis of pharmaceutical preparations is disclosed.
    Type: Grant
    Filed: September 26, 1989
    Date of Patent: December 10, 1991
    Assignee: Carter-Wallace, Inc.
    Inventor: Frank J. Stiefel
  • Synthesis of 2-phenyl-1,3-propanediol
    Patent number: 4868327
    Abstract: A novel method for preparing 2-phenyl-1, 3-propanediol and its dicarbamate is disclosed which readily lends itself to commercial production.
    Type: Grant
    Filed: June 3, 1987
    Date of Patent: September 19, 1989
    Assignee: Carter-Wallace, Inc.
    Inventor: Frank J. Stiefel
  • Synthesis of .beta.-((2-methylpropoxy)methyl)-N-phenyl-N-(phenylmethyl)-1-pyrrolidine ethanamine
    Patent number: 4620015
    Abstract: A novel, efficient, economical procedure for the synthesis of ethers of n-propanoldiamine having the formula: ##STR1## wherein R is a straight or branched chain lower alkyl group or an aralkyl group, Ar is an aromatic group, Ar.sup.1 is an aromatic or heterocyclic group, A is a tertiary aliphatic, cycloaliphatic or heterocyclic amino group and addition salts thereof with pharmacologically acceptable acids.
    Type: Grant
    Filed: August 10, 1983
    Date of Patent: October 28, 1986
    Assignee: Carter-Wallace, Inc.
    Inventor: Frank J. Stiefel
  • Oxazolidine propionic acid methyl esters
    Patent number: 4310674
    Abstract: A novel chemical compounds of the formula ##STR1## wherein R is hydrogen or branched or straight chain lower alkyl of from 1-6 carbon atoms as well as methods for preparing such compounds.
    Type: Grant
    Filed: July 18, 1980
    Date of Patent: January 12, 1982
    Assignee: Carter-Wallace, Inc.
    Inventor: Frank J. Stiefel
  • Method for preparing basic dithienyl compounds
    Patent number: 4275198
    Abstract: Basic dithienyl compounds are prepared by hydrolysis of a compound of the formula ##STR1## wherein R is hydrogen or lower alkyl.
    Type: Grant
    Filed: July 18, 1980
    Date of Patent: June 23, 1981
    Assignee: Carter-Wallace Inc.
    Inventor: Frank J. Stiefel
  • Chemical process for preparation of 7-chloro-2-methyl-3,3a-dihydro-2H,9H-isoxazolo(3,2-b)(1,3)-benzoxazin-9- one
    Patent number: 4224443
    Abstract: The compound 7-chloro-2-methyl-3,3a-dihydro-2H,9H-isoxazolo(3,2-b)(1,3)-benzoxazin-9-on e is produced by reacting a mixture of tetrahydrofuran and crotonaldehyde with 5-chlorosalicylhydroxamic acid. The compound has demonstrated utility as a uricosuric agent.
    Type: Grant
    Filed: December 29, 1978
    Date of Patent: September 23, 1980
    Assignee: Carter-Wallace, Inc.
    Inventor: Frank J. Stiefel
  • Method for the preparation of 2,3-dimethyl-pent-4en-aldehyde
    Patent number: 4190607
    Abstract: A process for the production of 2-methyl-2-sec. butyl-1,3-propanediol from crotyl alcohol is disclosed. The diol obtained is useful in the manufacture of 2-methyl-2-(1-methylpropyl)-1,3-propanediol dicarbamate a valuable antihypertensive agent.
    Type: Grant
    Filed: September 29, 1978
    Date of Patent: February 26, 1980
    Assignee: Carter-Wallace, Inc.
    Inventor: Frank J. Stiefel