Granted Patent
Utility
US 4,469,911 · App. 06/439,735
Isobutene removal from C.sub.4 streams
Inventor:
Harold E. Manning
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Nov 8, 1982
Inventor
Harold E. Manning
Assignee (at issue)
Petro-Tex Chemical 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.