Granted Patent
Utility
US 4,946,582 · App. 07/299,025
Method of removing mercury from hydrocarbon oils
Inventors:
Takashi Torihata, Etsuko Kawashima
Patented Case
View Patent ↗
Granted: Aug 7, 1990
Filed: Jan 19, 1989
Inventors
Takashi Torihata
Etsuko Kawashima
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.