Granted Patent
Utility
US 6,153,727 · App. 09/135,725
Extraction of metal residues from polymer cements
Inventors:
John D. Wilkey, Zaida Diaz
Patented Case
View Patent ↗
Granted: Nov 28, 2000
Filed: Aug 18, 1998
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.