Granted Patent
Utility
US 4,276,399 · App. 06/025,418
Supported catalyst from chromium for olefin polymerization
Inventors:
Louis J. Rekers, Anthony N. Speca
Patented Case
View Patent ↗
Granted: Jun 30, 1981
Filed: Mar 30, 1979
Inventors
Louis J. Rekers
Anthony N. Speca
Assignee (at issue)
National Petro Chemicals 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.