Granted Patent
Utility
US 4,861,934 · App. 07/163,188
Production of high-octane gas blending stock
Inventors:
Isao Suzuki, Kazuo Hirabayashi, Tadami Kondoh, Hiroaki Nishijima
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Feb 25, 1988
Inventors
Isao Suzuki
Kazuo Hirabayashi
Tadami Kondoh
Hiroaki Nishijima
Assignee (at issue)
Research Association for the Utilization of Light Oil
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.