Granted Patent
Utility
US 5,308,596 · App. 07/986,983
Process for the production of crystalline sodium disilicate in an externally heated rotary kiln having temperature zones
Inventors:
Michael Kotzian, Gunther Schimmel, Alexander Tapper, Knut Bauer
Patented Case
View Patent ↗
Granted: May 3, 1994
Filed: Dec 8, 1992
Inventors
Michael Kotzian
Gunther Schimmel
Alexander Tapper
Knut Bauer
Assignee (at issue)
Hoechst 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.