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:
Nov. 03, 2009
Filed:
Jan. 27, 2004
Jozsef Neu, Budapest, HU;
Janos Fischer, Budapest, HU;
Tamas Fodor, Budapest, HU;
Jozsef Törley, Budapest, HU;
Tibor Gizur, Budapest, HU;
Sandor Levai, Biatorbagy, HU;
Adam Demeter, Budapest, HU;
Eva Perenyi, Budapest, HU;
Jozsef Neu, Budapest, HU;
Janos Fischer, Budapest, HU;
Tamas Fodor, Budapest, HU;
Jozsef Törley, Budapest, HU;
Tibor Gizur, Budapest, HU;
Sandor Levai, Biatorbagy, HU;
Adam Demeter, Budapest, HU;
Eva Perenyi, Budapest, HU;
Richter Gedeon Vegyeszeti Gyar Rt., Budapest, HU;
Abstract
Process for the synthesis of high purity 2-substituted-1-(hydroxy-ethylidene)-1,1-bisphosphonic acid of formula (I), the salts and hydrates thereof—wherein the meaning of R is 3'-pyridyl or 2′-amino-ethylidene group—from compounds of formula (II)—wherein the meaning of R is as described above—or salts and hydrates thereof with phosphorous acid in the presence of methanesulfonic acid using phosphorus pentoxide as reagent and in given case the obtained acid is converted into a salt with base.