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:
Oct. 08, 2013
Filed:
Jul. 03, 2009
Tangirala Prakasam, Chennai, IN;
Borkatte Narasimha Hitesh Kumar, Chennai, IN;
Sangu Perumal, Kanchipuram Dt., IN;
Kothandapani Loganathan, Chennai, IN;
Tangirala Prakasam, Chennai, IN;
Borkatte Narasimha Hitesh Kumar, Chennai, IN;
Sangu Perumal, Kanchipuram Dt., IN;
Kothandapani Loganathan, Chennai, IN;
Malladi Drugs & Pharmaceuticals Ltd., Chennai, IN;
Abstract
The invention disclosed in this application relates to an improved process for the manufacture of d-threo-ritalinic acid hydrochloride and l-threo-ritalinic acid hydrochloride in an optically pure form by the resolution of dl-threo-ritalinic acid using a chiral carboxylic acid The d-threo-ritalinic acid hydrochloride prepared by the process of the present invention on esterification gives d-threo-methylphenidate, a very well known CNS stimulant.