Granted Patent
Utility
US 5,767,207 · App. 08/652,084
Removal of lithium from polymer cements
Inventors:
John D. Wilkey, Zaida Diaz
Patented Case
View Patent ↗
Granted: Jun 16, 1998
Filed: May 23, 1996
Inventors
John D. Wilkey
Zaida Diaz
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.