The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 22, 1984
Filed:
Oct. 02, 1981
Applicant:
Inventor:
Georges Philippossian, Lausanne, CH;
Assignee:
Societe d'Assistance Technique pour Produits Nestle S.A., Lausanne, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; A61K / ;
U.S. Cl.
CPC ...
424253 ; 544271 ; 544273 ;
Abstract
The invention relates to a process for the preparation of 1,3,7-trialkyl xanthines, i.e. xanthines completely substituted on the nitrogen atoms, by the N-alkylation of xanthines by phase transfer catalysis. Some of the trialkyl xanthines obtained are new and di(3,7-dimethylxanthin-1-yl)methane is described as a medicament having immunosupressant properties.