Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2007-01-16
2009-02-03
Aulakh, Charanjit S (Department: 1625)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
active
07485726
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.
REFERENCES:
patent: WO 2006/051553 (2006-05-01), None
Dandala Ramesh
Divvela Srinivasa Rao V. N
Meenakshisunderam Sivakumaran
Racha Lenin
Akhave Jay R
Aulakh Charanjit S
Aurobindo Pharma Ltd.
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