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:
Aug. 14, 2012
Filed:
Jul. 01, 2011
Bandi Parthasaradhi Reddy, Hyderabad, IN;
Kura Rathnakar Reddy, Hyderabad, IN;
Rapolu Raji Reddy, Hyderabad, IN;
Dasari Muralidhara Reddy, Hyderabad, IN;
Kesireddy Subash Chander Reddy, Hyderabad, IN;
Bandi Parthasaradhi Reddy, Hyderabad, IN;
Kura Rathnakar Reddy, Hyderabad, IN;
Rapolu Raji Reddy, Hyderabad, IN;
Dasari Muralidhara Reddy, Hyderabad, IN;
Kesireddy Subash Chander Reddy, Hyderabad, IN;
Hetero Drugs Limited, , IN;
Abstract
The present invention relates to novel amorphous and crystalline forms of efavirenz, processes for their preparation and pharmaceutical compositions containing them. In accordance with the present invention efavirenz crude is dissolved in acetone at 25° C.-30° C., the solution is slowly added to water for 30 minutes at 0° C.-5° C., stirred for 1 hour at the same temperature, the separated solid is filtered, washed with water and dried at 55° C.-60° C. for 5 hours to give amorphous efavirenz.