Patents by Inventor Derek C. Riley

Derek C. Riley 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 preparing steroid compounds of controlled particle size
    Patent number: 4605517
    Abstract: The method of preparing a 2.alpha.-cyano-4.alpha.,5.alpha.-epoxy-3-oxo steroid or a steroid fused at the 2- and 3-positions with a heterocyclic ring of controlled particle size which comprises dissolving the steroid in an organic solvent, precipitating the steroid by mixing a non-solvent for the steroid with the resulting solution, and controlling the time of mixing and the degree of agitation during mixing.
    Type: Grant
    Filed: October 11, 1984
    Date of Patent: August 12, 1986
    Assignee: Sterling Drug Inc.
    Inventors: Derek C. Riley, David Johnston