Granted Patent
Utility
US 6,369,251 · App. 09/553,852
Method for purification of polyprenyl compounds
Inventors:
Michika Takano, Noriaka Gomi
Patented Case
View Patent ↗
Granted: Apr 9, 2002
Filed: Apr 21, 2000
Inventors
Michika Takano
Noriaka Gomi
Assignee (at issue)
Nikken Chemicals Co., Ltd.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.