Granted Patent
Utility
US 4,874,526 · App. 07/199,224
Treatment of water
Inventors:
Reinhardt Grade, Brien M. Thomas
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: May 26, 1988
Inventors
Reinhardt Grade
Brien M. Thomas
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.