Granted Patent
Utility
US 6,793,905 · App. 10/110,064
Method for producing high-purity hydrochloric acid
Inventors:
Werner Buttner, Martin Hostalek, Ching-Jung Kan, Chih-Peng Lu
Patented Case
View Patent ↗
Granted: Sep 21, 2004
Filed: Apr 8, 2002
Inventors
Werner Buttner
Martin Hostalek
Ching-Jung Kan
Chih-Peng Lu
Assignee (at issue)
Merck Patent GmbH
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.