Patents by Inventor Edward Leon Grew

Edward Leon Grew 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).

  • Dehydrohalogenation of a 7-halodihydrocodeinone dialkyl ketal
    Patent number: 4025520
    Abstract: A process for the dehydrohalogenation of a 7-halo- or a 1,7-dihalodihydrocodeinone dialkyl ketal of the general formula (I): ##STR1## in which R represents an alkyl group containing from 1 to 6 carbon atoms, X represents hydrogen or chlorine or bromine and Y represents chlorine or bromine which comprises subjecting the ketal to the action of a base in the presence of a polar aprotic solvent. The process has utility in facilitating the production of codeine.
    Type: Grant
    Filed: March 28, 1975
    Date of Patent: May 24, 1977
    Assignee: Macfarlan Smith Limited
    Inventors: Edward Leon Grew, Nigel David Vaughan Wilson