Granted Patent
Utility
US 6,422,492 · App. 09/358,290
Apparatus for treating ion-exchange resin
Inventors:
Johann Lisson, Karl-Heinz Kleinschroth, Robert Grigat, Klaus Blinn
Patented Case
View Patent ↗
Granted: Jul 23, 2002
Filed: Jul 21, 1999
Inventors
Johann Lisson
Karl-Heinz Kleinschroth
Robert Grigat
Klaus Blinn
Assignee (at issue)
Siemens Aktiengesellschaft
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.