Granted Patent
Utility
US 5,908,559 · App. 09/003,417
Method for recovering and separating metals from waste streams
Inventor:
Lawrence Kreisler
Patented Case
View Patent ↗
Granted: Jun 1, 1999
Filed: Jan 6, 1998
Inventor
Lawrence Kreisler
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.