Granted Patent
Utility
US 5,143,990 · App. 07/522,693
Termination of anionic polymerization using hydrogen
Inventors:
Carma J. Gibler, Linda R. Chamberlain, Thomas F. Brownscombe
Patented Case
View Patent ↗
Granted: Sep 1, 1992
Filed: May 14, 1990
Inventors
Carma J. Gibler
Linda R. Chamberlain
Thomas F. Brownscombe
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.