Granted Patent
Utility
US 4,847,423 · App. 07/163,450
Hydroformylation of aqueous formaldehyde using a rhodium-tricyclohexylphosphine catalyst system
Inventors:
Robert Koprowski, Jerry D. Unruh
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: Mar 3, 1988
Inventors
Robert Koprowski
Jerry D. Unruh
Assignee (at issue)
Hoechst Celanese 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.