Granted Patent
Utility
US 5,879,556 · App. 08/378,150
Method of recovering extractant
Inventor:
Hans C. Hein
Patented Case
View Patent ↗
Granted: Mar 9, 1999
Filed: Jan 25, 1995
Inventor
Hans C. Hein
Assignee (at issue)
Henkel 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.