Patents by Inventor John G. Thorpe

John G. Thorpe 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).

  • Process for preparing 2-oxo-dihydrobenzo(d)(1,3)-oxazines
    Patent number: 4301283
    Abstract: A process for preparing 2-oxo-dihydrobenzo[d][1,3]oxazines (also named 1,4-dihydro-2H-3,1-benzoxazin-2-ones) which process comprises treating a suspension or solution of a 2-carbamoyl-benzyl alcohol in a substantially water-immiscible organic medium with aqueous alkaline hypochlorite or hypobromite having a pH of at least 11 in the presence of a phase transfer catalyst; and conversion of the 2-oxo-dihydrobenzo[d][1,3]oxazines to corresponding 2-amino-benzyl alcohols which are useful as intermediates in the production of dyes, pharmaceuticals and herbicides.
    Type: Grant
    Filed: September 10, 1980
    Date of Patent: November 17, 1981
    Assignee: Sterling Drug Inc.
    Inventors: John G. Thorpe, Peter G. Urben