Granted Patent
Utility
US 4,492,771 · App. 06/432,958
Process for producing carbon material for de-sulfurization from a binder with a blend of noncoking and coking coal
Inventors:
Takashi Hasegawa, Koji Tsuchihashi, Hiroshi Yamashita
Patented Case
View Patent ↗
Granted: Jan 8, 1985
Filed: Sep 24, 1982
Inventors
Takashi Hasegawa
Koji Tsuchihashi
Hiroshi Yamashita
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.