Granted Patent
Utility
US 4,480,138 · App. 06/433,749
Hydroformylation process
Inventors:
E. B. Hackman, L. D. Zeagler
Patented Case
View Patent ↗
Granted: Oct 30, 1984
Filed: Oct 12, 1982
Inventors
E. B. Hackman
L. D. Zeagler
Assignee (at issue)
Celanese GmbH
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.