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:
Dec. 30, 2008
Filed:
Nov. 13, 2006
Ashok Kumar, Maharashtra, IN;
Suneel Yeshwant Dike, Maharashtra, IN;
Satish Rajanikant Soudagar, Maharashtra, IN;
Chirag Hasmukh Shah, Maharashtra, IN;
Sandeep Madhavrao Burudkar, Maharashtra, IN;
Prashant Gautam, Maharashtra, IN;
Byju Nellithanath Thankachen, Maharashtra, IN;
Ashvini Saxena, Madhya Pradesh, IN;
Manavalan Saravanan, Madhya Pradesh, IN;
Gunjan Pramod Pathak, Madhya Pradesh, IN;
Virendra Pal, Madhya Pradesh, IN;
Rahul Karde, Madhya Pradesh, IN;
Jaysingh Gehlot, Madhya Pradesh, IN;
Ashok Kumar, Maharashtra, IN;
Suneel Yeshwant Dike, Maharashtra, IN;
Satish Rajanikant Soudagar, Maharashtra, IN;
Chirag Hasmukh Shah, Maharashtra, IN;
Sandeep Madhavrao Burudkar, Maharashtra, IN;
Prashant Gautam, Maharashtra, IN;
Byju Nellithanath Thankachen, Maharashtra, IN;
Ashvini Saxena, Madhya Pradesh, IN;
Manavalan Saravanan, Madhya Pradesh, IN;
Gunjan Pramod Pathak, Madhya Pradesh, IN;
Virendra Pal, Madhya Pradesh, IN;
Rahul Karde, Madhya Pradesh, IN;
Jaysingh Gehlot, Madhya Pradesh, IN;
IPAC Laboratories Limited, Mumbai, IN;
Abstract
A process for the resolution of isomeric tramadol mixtures comprising: providing a purification stock comprising both cis and trans tramadol; contacting the purification stock with an acid under conditions effective to form an acid salt of the cis and trans tramadol in the purification stock; and separating the cis tramadol acid salt from the trans tramadol to obtain a purified cis tramadol acid salt; and optionally converting the cis tramadol acid salt to cis tramadol or to a pharmaceutically active salt thereof.