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:
Feb. 03, 2009
Filed:
Jan. 16, 2007
Applicants:
Srinivasa Rao V. N Divvela, Hyderabad, IN;
Lenin Racha, Hyderabad, IN;
Sivakumaran Meenakshisunderam, Hyderabad, IN;
Ramesh Dandala, Hyderabad, IN;
Inventors:
Srinivasa Rao V. N Divvela, Hyderabad, IN;
Lenin Racha, Hyderabad, IN;
Sivakumaran Meenakshisunderam, Hyderabad, IN;
Ramesh Dandala, Hyderabad, IN;
Assignee:
Aurobindo Pharma Ltd., Hyderabad, IN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07F 9/38 (2006.01); C07D 213/30 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention relates to an improved process for the selective crystallization of 3-pyridyl-1-hydroxyethylidene-1,1-bisphosphonic acid sodium in pure hemi-pentahydrate form of Formula (I), by first converting 3-pyridyl-1-hydroxyethylidene-1,1-bisphosphonic acid into organic amine salt and then by replacing it with sodium salt.