Granted Patent
Utility
US 4,261,865 · App. 06/091,722
Catalyst for olefin production
Inventor:
Duane C. Hargis
Patented Case
View Patent ↗
Granted: Apr 14, 1981
Filed: Nov 6, 1979
Inventor
Duane C. Hargis
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.