Granted Patent
Utility
US 4,631,177 · App. 06/751,211
Method for recovering gallium
Inventors:
Takao Yotsuyanagi, Yoshinobu Nishiyama
Patented Case
View Patent ↗
Granted: Dec 23, 1986
Filed: Jul 2, 1985
Inventors
Takao Yotsuyanagi
Yoshinobu Nishiyama
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.