Granted Patent
Utility
US 6,207,795 · App. 09/371,303
Removal of hydrogenation catalyst from polymer solutions by treatment with ammonia and carbon dioxide
Inventor:
John D. Wilkey
Patented Case
View Patent ↗
Granted: Mar 27, 2001
Filed: Aug 10, 1999
Inventor
John D. Wilkey
Assignee (at issue)
SHELL OIL 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.