Patents by Inventor Christopher E. M. Griffiths

Christopher E. M. Griffiths 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 treating post-inflammatory hyperpigmentation in black skin with a retinoid, and method of lightening black skin with a retinoid
    Patent number: 6017960
    Abstract: Treatment of post-inflammatory hyperpigmentation (PIH) in black and asian skin is accelerated from natural healing by use of a composition comprising a retinoid and/or an inhibitor of cytochrome P-450 enzyme-mediated degradation of retinoids, the composition does not require a conventional depigmenting or bleaching agent (such as a hydroquinone) as is typically used. Healing of PIH lesions is accelerated about three to five times from normal healing. Additionally, these compositions are useful separately for lightening black or asian skin.
    Type: Grant
    Filed: May 12, 1998
    Date of Patent: January 25, 2000
    Assignee: Regents of the University of Michigan
    Inventors: John J. Voorhees, Charles N. Ellis, Christopher E. M. Griffiths
  • Method of treatment of hyperpigmentation in black skin with retinoic acid and method of lightening black skin with retinoic acid
    Patent number: 5750570
    Abstract: Hyperpigmentation of black skin may be treated by topical application of retinoic acid to the skin. Topical application of retinoic acid is also effective for lightening normal black skin.
    Type: Grant
    Filed: March 31, 1992
    Date of Patent: May 12, 1998
    Assignee: The Regents of the University of Michigan
    Inventors: John J. Voorhees, Charles N. Ellis, Christopher E. M. Griffiths
  • Retinoic acid as a skin tanning agent in persons of light skin color
    Patent number: 5266307
    Abstract: Topical application of retinoic acid is effective for increasing the tyrosinase activity in the skin of people having light skin. Thus, topical application of retinoic acid may be used to effect a suntan in people having light skin and as a consequence protect against photodamage.
    Type: Grant
    Filed: March 31, 1992
    Date of Patent: November 30, 1993
    Assignee: The Regents of the University of Michigan
    Inventors: John J. Voorhees, Christopher E. M. Griffiths, Charles N. Ellis