Granted Patent
Utility
US 5,695,631 · App. 08/071,637
Process for producing petroleum needle coke
Inventors:
Junji Eguchi, Hiroichi Miyasaka, Masami Kinouchi, Yoichi Ohashi, Takeshi Hori, Yuji Yamamura
Patented Case
View Patent ↗
Granted: Dec 9, 1997
Filed: Jun 4, 1993
Inventors
Junji Eguchi
Hiroichi Miyasaka
Masami Kinouchi
Yoichi Ohashi
Takeshi Hori
Yuji Yamamura
Assignee (at issue)
MITSUBISHI CHEMICAL 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.