Granted Patent
Utility
US 5,264,128 · App. 07/619,274
Water purification process
Inventors:
Markus Thuer, Gerhard Stucki, Rolf Bentz
Patented Case
View Patent ↗
Granted: Nov 23, 1993
Filed: Nov 28, 1990
Inventors
Markus Thuer
Gerhard Stucki
Rolf Bentz
Assignee (at issue)
Ciba-Geigy
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.