Granted Patent
Utility
US 5,783,159 · App. 08/909,529
Inorganic impurities removal in soda ash solutions with carbon
Inventor:
Eric Aldinger
Patented Case
View Patent ↗
Granted: Jul 21, 1998
Filed: Aug 12, 1997
Inventor
Eric Aldinger
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.