IP Library › Granted Patent US 5,824,221
Granted Patent Utility
US 5,824,221 · App. 08/026,914

Water purification process

Inventors: Markus Thuer, Gerhard Stucki, Michael Reisinger
Patented Case View Patent ↗
Granted: Oct 20, 1998 Filed: Mar 5, 1993
Inventors
Markus Thuer
Gerhard Stucki
Michael Reisinger
Assignee (at issue)
Ciba Specialty Chemicals Corporation

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.

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Quick Facts
Patent No.
US 5,824,221
App. No.
08/026,914
Filed
1993-03-05
Granted
1998-10-20
Kind
A