Granted Patent
Utility
US 6,608,147 · App. 10/020,381
Method for preparing polyether copolymers with polycarbonates and polyarylates
Inventor:
Tohru Takekoshi
Patented Case
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Granted: Aug 19, 2003
Filed: Dec 14, 2001
Inventor
Tohru Takekoshi
Assignee (at issue)
General Electric Company
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.