Granted Patent
Utility
US 6,289,989 · App. 09/297,480
Use of biodegradable alcoxylation products for cleaning boreholes, boring instruments or borings
Inventors:
Heinz Mueller, Claus-Peter Herold, Berthold Schreck, Stefan Podubrin, Andreas Heidbreder
Patented Case
View Patent ↗
Granted: Sep 18, 2001
Filed: Jul 2, 1999
Inventors
Heinz Mueller
Claus-Peter Herold
Berthold Schreck
Stefan Podubrin
Andreas Heidbreder
Assignee (at issue)
Henkel Kommanditgesellschaft auf Aktien
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.