Granted Patent
Utility
US 4,201,747 · App. 05/949,010
Method of separating yttrium ions
Inventors:
Yukinori Minagawa, Tsugio Kaneko, Kunihiko Yamaguchi
Patented Case
View Patent ↗
Granted: May 6, 1980
Filed: Oct 6, 1978
Inventors
Yukinori Minagawa
Tsugio Kaneko
Kunihiko Yamaguchi
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.