Granted Patent
Utility
US 4,609,382 · App. 06/699,006
Solids concentrate which contains abrasive solids and causes little wear
Inventors:
Hans-Gerhard Fritz, Helmut Schule, Eberhard Grunschloss, Tomas Riedel, Karl-Heinz Maier
Patented Case
View Patent ↗
Granted: Sep 2, 1986
Filed: Feb 7, 1985
Inventors
Hans-Gerhard Fritz
Helmut Schule
Eberhard Grunschloss
Tomas Riedel
Karl-Heinz Maier
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.