Granted Patent
Utility
US 4,762,897 · App. 07/045,718
Process for recovering a mixture of unreacted ethylene and propylene
Inventors:
Tadashi Asanuma, Yoshiyuki Funakoshi, Tatuo Ohoka
Patented Case
View Patent ↗
Granted: Aug 9, 1988
Filed: Apr 29, 1987
Inventors
Tadashi Asanuma
Yoshiyuki Funakoshi
Tatuo Ohoka
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.