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:
Jun. 28, 2011
Filed:
Mar. 21, 2007
Pandurang Balwant Deshpande, Vadodara, IN;
Ashok Prataprai Shanishchara, Vadodara, IN;
Trushar Rajanikant Shah, Vadodara, IN;
Hitarth Harshendu Acharya, Vadodara, IN;
Parven Kumar Luthra, Vadodara, IN;
Pandurang Balwant Deshpande, Vadodara, IN;
Ashok Prataprai Shanishchara, Vadodara, IN;
Trushar Rajanikant Shah, Vadodara, IN;
Hitarth Harshendu Acharya, Vadodara, IN;
Parven Kumar Luthra, Vadodara, IN;
Alembic Limited, Vadodara, IN;
Abstract
An improved process is described for the purification of ropinirole hydrochloride. The process includes (i) dissolving ropinirole hydrochloride in water; (ii) treating the solution obtained in step (i) with sodium dithionate and charcoal; (iii) treating the filtrate obtained in step (ii) with water immiscible solvent and base and isolating the free base; and (iv) treating the free base obtained in step (iii) with ethanolic HCl to give ropinirole hydrochloride.