Patents by Inventor Walter M. Bryant, III

Walter M. Bryant, III 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 3,3-disubstituted indolines
    Patent number: 4806651
    Abstract: Processes for preparing 3,3-disubstituted indolines, particularly 3,3-dipyridine substituted indolines useful to treat cognitive or neurological dysfunction in a mammal, are provided.
    Type: Grant
    Filed: October 7, 1987
    Date of Patent: February 21, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Walter M. Bryant, III, George F. Huhn
  • Dealkylation of opioid ethers
    Patent number: 4667037
    Abstract: An improved process for the dealkylation of alkyl aryl ethers to aryl phenols is provided. In this process, an alkyl aryl ether, such as a methyl ether of an opioid, is contacted with an aqueous acid selected from HBr, HCl, or HI which contains at least one equivalent weight, based on the ether, of boric acid or an inorganic salt of a metal selected from Li, Na, K, Al, Mg, Ca, Mn and Ni. MgBr.sub.2 in aqueous HBr is preferred in dealkylating an N-substituted 14-hydroxydihydronorcodeine.
    Type: Grant
    Filed: June 6, 1985
    Date of Patent: May 19, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Walter M. Bryant, III