Granted Patent
Utility
US 4,980,028 · App. 06/815,181
Method of controlling fuel for a coke oven
Inventors:
Yoshio Yoshino, Koji Tsuchihashi, Yoshihiro Omae, Kenzo Tsujikawa, Yukio Yamaguchi
Patented Case
View Patent ↗
Granted: Dec 25, 1990
Filed: Dec 23, 1985
Inventors
Yoshio Yoshino
Koji Tsuchihashi
Yoshihiro Omae
Kenzo Tsujikawa
Yukio Yamaguchi
Assignee (at issue)
Mitsubishi Kasei 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.