Granted Patent
Utility
US 4,054,538 · App. 05/385,304
.pi. Allyl chromium complex catalyst and process for preparing same
Inventors:
Robert N. Johnson, Frederick J. Karol
Patented Case
View Patent ↗
Granted: Oct 18, 1977
Filed: Aug 3, 1973
Inventors
Robert N. Johnson
Frederick J. Karol
Assignee (at issue)
Union Carbide 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.