The opinion in support of the decision being entered today was not written for
publication and is not binding precedent of the Board.
UNITED STATES PATENT AND TRADEMARK OFFICE
___________
BEFORE THE BOARD OF PATENT APPEALS
AND INTERFERENCES
___________
Ex parte MARIANNE LANGSTON
and
HOOSHANG S. ZAVAREH
____________
Appeal No. 2006-0881
Application No. 09/928,139
_____________
ON BRIEF
_____________
Before GARRIS, PAK, and JEFFREY T. SMITH, Administrative Patent Judges.
GARRIS, Administrative Patent Judge.
DECISION ON APPEAL
This is a decision on an appeal which involves claims 1-8.
The subject matter on appeal relates to a process for obtaining single enantiomer d-threo
methylphenidate or l-threo-methylphenidate, which comprises resolution of a mixture of these
enantiomers and racemization of the unwanted enantiomer to give a mixture of all four
stereoisomers, wherein the racemization comprises reacting the unwanted enantiomer with an
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