Granted Patent
Utility
US 5,120,856 · App. 07/555,118
Pyrrolidinones and pyrrolidin thiones, and metal complexes thereof
Inventors:
Mark Robert James, Gordon Thomson
Patented Case
View Patent ↗
Granted: Jun 9, 1992
Filed: Jul 19, 1990
Inventors
Mark Robert James
Gordon Thomson
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.