Granted Patent
Utility
US 5,308,595 · App. 07/976,395
Process for the extraction of gallium
Inventors:
Peter M. Quan, Stephen William Leeming
Patented Case
View Patent ↗
Granted: May 3, 1994
Filed: Nov 13, 1992
Inventors
Peter M. Quan
Stephen William Leeming
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.