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. 16, 2007
Filed:
Aug. 10, 2001
Applicants:
Marianne Langston, Cambridge, GB;
Hooshang Shahriari Zavareh, Cambridge, GB;
Inventors:
Marianne Langston, Cambridge, GB;
Hooshang Shahriari Zavareh, Cambridge, GB;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 211/34 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention pertains to a process for obtaining a single enantiomer, d or l, of threo-methylphenidate, comprising resolution of a mixture of the enantiomers; racemisation of the unwanted enantiomer, to give a mixture of all four stereoisomers; and separation of the erythro stereoisomers, to leave the same mixture of enantiomers for resolution.