Granted Patent
Utility
US 5,302,187 · App. 07/975,158
Concentration process of gaseous chlorine
Inventors:
Hiroyuki Itoh, Yoshitsugu Kono, Shinji Takenaka, Yukihiro Yoshikawa, Isao Kikuchi, Teruo Hirayama
Patented Case
View Patent ↗
Granted: Apr 12, 1994
Filed: Nov 12, 1992
Inventors
Hiroyuki Itoh
Yoshitsugu Kono
Shinji Takenaka
Yukihiro Yoshikawa
Isao Kikuchi
Teruo Hirayama
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.