Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Having -c- – wherein x is chalcogen – bonded directly to...
Reexamination Certificate
2005-02-07
2011-11-01
Andres, Janet (Department: 1625)
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Having -c-, wherein x is chalcogen, bonded directly to...
Reexamination Certificate
active
08048914
ABSTRACT:
Methods for extraction, isolation, and purification of therapeutically useful compounds fromTripterygium wilfordiiare described. Extraction steps employing aqueous base and a hydrocarbon solvent, respectively, are found to increase the efficiency of the process and reduce the amount of material that must be removed by chromatography.
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An Jinhua
Musser John H.
Xu Rensheng
Andres Janet
Dehlinger Peter J.
King & Spalding LLP
Mabry John
Myers Fitch Susan J.
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