Patents by Inventor Andrew A. Znotins

Andrew A. Znotins 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).

  • Method of making 5,6-dihydro-2-methyl-N-phenyl-1,4-oxathiin-3-carboxamide
    Patent number: 4247707
    Abstract: This method of making 5,6-dihydro-2-methyl-N-phenyl-1,4-oxathiin-3-carboxamide is based on the use of an oxathiolane, namely, 2-methyl-N-phenyl-1,3-oxathiolane-2-acetamide, which may be formed by condensing 2-mercaptoethanol with acetoacetanilide under acidic conditions in a solvent medium (aromatic hydrocarbon, chlorinated hydrocarbon or alkyl ester of an aliphatic acid). The said oxathiolane, with or without purification, is reacted with hydrogen peroxide in water or in a water-organic solvent mixture under basic conditions in the presence of a catalytic amount of a metal compound such as sodium tungstate to form 2-methyl-N-phenyl-1,3-oxathiolane-2-acetamide 3-oxide.
    Type: Grant
    Filed: August 31, 1979
    Date of Patent: January 27, 1981
    Inventors: Andrew A. Znotins, Arthur D. Brewer
  • Method of making 5,6-dihydro-2-methyl-N-phenyl-1,4-oxathiin-3-carboxamide
    Patent number: 4182716
    Abstract: This method of making 5,6-dihydro-2-methyl-N-phenyl-1,4-oxathiin-3-carboxamide is based on the use of an oxathiolane, namely, 2-methyl-N-phenyl-1,3-oxathiolane-2-acetamide, which may be formed by condensing 2-mercaptoethanol with acetoacetanilide under acidic conditions in a solvent medium (aromatic hydrocarbon, chlorinated hydrocarbon or alkyl ester of an aliphatic acid). The said oxathiolane, with or without purification, is reacted with hydrogen peroxide in water or in a water-organic solvent mixture under basic conditions in the presence of a catalytic amount of a metal compound such as sodium tungstate to form 2-methyl-N-phenyl-1,3-oxathiolane-2-acetamide 3-oxide.
    Type: Grant
    Filed: November 8, 1978
    Date of Patent: January 8, 1980
    Assignee: Uniroyal, Ltd.
    Inventors: Andrew A. Znotins, Arthur D. Brewer