Granted Patent
Utility
US 6,458,995 · App. 09/540,124
Catalytic composition for carbonylation including iridium and pyridine polymers
Inventors:
Hung-Cheun Cheung, Elaine C. Sibrel, G. Torrence
Patented Case
View Patent ↗
Granted: Oct 1, 2002
Filed: Mar 31, 2000
Inventors
Hung-Cheun Cheung
Elaine C. Sibrel
G. Torrence
Assignee (at issue)
Celanese International 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.