Granted Patent
Utility
US 4,670,621 · App. 06/859,696
Catalytic synthesis of olefins from paraffins
Inventor:
Howard W. Walker
Patented Case
View Patent ↗
Granted: Jun 2, 1987
Filed: May 5, 1986
Inventor
Howard W. Walker
Assignee (at issue)
Ethyl 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.