Patents by Inventor Fernand Thyrion

Fernand Thyrion 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 converting a xanthine ring or xanthine ring derivatives into dialkylaminoxanthine derivatives
    Patent number: 5739331
    Abstract: The invention relates to a process for the preparation of bamifylline or etamiphylline, in which a mixture comprising:a) theophylline or 8-benzyltheophyl-line;b) an alkyl dihalide; andc) a molar excess of an amineis reacted in the presence of a weak base, the reaction being carried out at a temperature higher than 90.degree. C. and under a pressure higher than 10.sup.5.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: April 14, 1998
    Assignee: S.A. Nycomed Christiaens N.V.
    Inventors: Fernand Thyrion, Hong Yang, Michel Parmantier