Granted Patent
Utility
US 4,577,385 · App. 06/496,511
Method and apparatus for repairing a wall of coke oven
Inventors:
Yoshihiro Omae, Kunio Ishikawa, Takahisa Fukao, Katsushige Yoshida
Patented Case
View Patent ↗
Granted: Mar 25, 1986
Filed: May 20, 1983
Inventors
Yoshihiro Omae
Kunio Ishikawa
Takahisa Fukao
Katsushige Yoshida
Assignee (at issue)
Mitsubishi Chemical 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.