Granted Patent
Utility
US 5,141,997 · App. 07/568,113
Selective hydrogenation of conjugated diolefin polymers
Inventors:
Linda R. Chamberlain, Carma J. Gibler, Richard A. Kemp, Stanley E. Wilson
Patented Case
View Patent ↗
Granted: Aug 25, 1992
Filed: Aug 15, 1990
Inventors
Linda R. Chamberlain
Carma J. Gibler
Richard A. Kemp
Stanley E. Wilson
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.