Granted Patent
Utility
US 5,212,285 · App. 07/537,738
Removal of hydrogenation catalyst from polymer solutions by catalyzed precipitation
Inventors:
Zaida Diaz, Carma J. Gibler
Patented Case
View Patent ↗
Granted: May 18, 1993
Filed: Jun 14, 1990
Inventors
Zaida Diaz
Carma J. Gibler
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.