Granted Patent
Utility
US 4,649,128 · App. 06/800,233
Deactivator for olefin polymerization catalyst
Inventors:
Louis J. Rekers, Anthony N. Speca, Harry W. Mayhew
Patented Case
View Patent ↗
Granted: Mar 10, 1987
Filed: Nov 21, 1985
Inventors
Louis J. Rekers
Anthony N. Speca
Harry W. Mayhew
Assignee (at issue)
National Distillers and Chemical Corporation
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.