Patents by Inventor Christopher E. French

Christopher E. French 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).

  • Morphinone reductase for the preparation of hydromorphone and hydrocodone
    Patent number: 5571685
    Abstract: A morphinone reductase enzyme and related process provide for the preparation of hydromorphone from morphinone and hydrocodone from neopinone or codeinone. The enzyme has no significant activity with compounds of similar ring structure, has a molecular weight of approximately 81 kilodaltons and is composed of two identical subunits. The enzyme uses NADH as a cofactor and displays no significant enzymatic activity in the reverse direction.
    Type: Grant
    Filed: November 30, 1994
    Date of Patent: November 5, 1996
    Assignee: MacFarlan Smith Limited
    Inventors: Anne M. Hailes, Christopher E. French, Neil C. Bruce