Granted Patent
Utility
US 5,089,541 · App. 07/617,225
Removal of hydrogenation catalyst from polymer solutions by contact with activated carbon
Inventors:
Ajay Madhav Madgavkar, David Daum, Carma J. Gibler
Patented Case
View Patent ↗
Granted: Feb 18, 1992
Filed: Nov 23, 1990
Inventors
Ajay Madhav Madgavkar
David Daum
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.