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. 12, 2009
Filed:
Jul. 07, 2004
Marco Villa, Padova, IT;
Carla DE Faveri, Farra Di Soligo, IT;
Riccardo Zanotti, San Giorgio delle Pertiche, IT;
Francesco Ciardella, Padova, IT;
Fabrizio Borin, Selvazzano Dentro, IT;
Marco Villa, Padova, IT;
Carla De Faveri, Farra Di Soligo, IT;
Riccardo Zanotti, San Giorgio delle Pertiche, IT;
Francesco Ciardella, Padova, IT;
Fabrizio Borin, Selvazzano Dentro, IT;
Lundbeck Pharmaceuticals Italy, S.p.A., Padova, IT;
Abstract
A new process for the preparation and purification of 4-4'-diamino-diphenyl-sulfone (dapsone) is described. The process described is a three step process comprising a condensation reaction with the synthesis of a thioether intermediate and then steps of oxidation and reduction in suitable conditions in order to obtain a product with good yield and purity.