Patents by Inventor E. John Alexander

E. John Alexander 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).

  • 4,5-Dihydro-5-oxopyrazolo[1,5-a]quinazoline-3-carboxylic acid derivatives
    Patent number: 4105766
    Abstract: 4,5-Dihydro-5-oxopyrazolo[1,5-a]quinazoline-3-carboxylic acids and esters and alkali metal salts thereof, useful as anti-inflammatory, anti-allergic and anti-parasitic agents, are prepared by reacting a 4- or 5-R.sub.3 -2-carboxyphenylhydrazine with a lower-alkyl ethoxymethylenecyanoacetate and, if desired, saponifying the ester group and if desired, N-alkylating the product by reaction with an R.sub.2 -halide in the presence of an acid-acceptor.
    Type: Grant
    Filed: August 19, 1977
    Date of Patent: August 8, 1978
    Assignee: Sterling Drug Inc.
    Inventor: E. John Alexander
  • 4,5-Dihydro-5-oxopyrazolo[1,5-A]quinazoline-3-carboxamides
    Patent number: 4105764
    Abstract: 4,5-Dihydro-5-oxopyrazolo[1,5-a]quinazoline-3-carboxamides, useful as anti-secretory agents, are prepared by reaction of an appropriate 4-R.sub.2 -4,5-dihydro-5-oxopyrazolo[1,5-a]quinazoline-3-carboxylic acid halide with an appropriate amine.
    Type: Grant
    Filed: August 19, 1977
    Date of Patent: August 8, 1978
    Assignee: Sterling Drug Inc.
    Inventor: E. John Alexander