Patents by Inventor Rolf Thomessen

Rolf Thomessen 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 the production of 9-(Z)-retinoic acid
    Patent number: 7015353
    Abstract: A process for the production of 9-(Z)-retinoic acid is described which comprises reacting an alkali metal salt of 3-methyl-4-oxocrotonic acid with a C15-triphenyl-phosphonium salt. 9-(Z)-retinoic acid is used in the treatment of dermatological diseases.
    Type: Grant
    Filed: April 7, 2004
    Date of Patent: March 21, 2006
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Milan Soukup, Rolf Thomessen
  • Process for the production of 9-(Z)-retinoic acid
    Publication number: 20040235951
    Abstract: A process for the production of 9-(Z)-retinoic acid is described which comprises reacting an alkali metal salt of 3-methyl-4-oxocrotonic acid with a C15-triphenyl-phosphonium salt. 9-(Z)-retinoic acid is used in the treatment of dermatological diseases.
    Type: Application
    Filed: April 7, 2004
    Publication date: November 25, 2004
    Inventors: Milan Soukup, Rolf Thomessen