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:
Jan. 04, 2011
Filed:
Mar. 21, 2007
Pandurang Balwant Deshpande, Vadodara, IN;
Parven Kumar Luthra, Vadodara, IN;
Hitarth Harshendu Acharya, Vadodara, IN;
Pandurang Balwant Deshpande, Vadodara, IN;
Parven Kumar Luthra, Vadodara, IN;
Hitarth Harshendu Acharya, Vadodara, IN;
Alembic Limited, Vadodara, IN;
Abstract
The present invention provides an improved process for the purification of ropinirole hydrochloride. The process includes (i) treating ropinirole hydrochloride with sodium dithionate and charcoal in suitable alcoholic solvent; (ii) triturating the ropinirole hydrochloride obtained in step (i) with ethanol; (iii) reacting the triturated solid with base in water immiscible solvent and isolating the free base; and (iv) treating the free base obtained in step (iii) with ethanolic HCl to give ropinirole hydrochloride.