Granted Patent
Utility
US 5,580,443 · App. 08/241,676
Process for cracking low-quality feed stock and system used for said process
Inventors:
Masahiko Yoshida, Yutaka Kitayama, Tsukasa Iida
Patented Case
View Patent ↗
Granted: Dec 3, 1996
Filed: May 12, 1994
Inventors
Masahiko Yoshida
Yutaka Kitayama
Tsukasa Iida
Assignee (at issue)
Mitsui Petrochemical Industries, Ltd.
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.