Granted Patent
Utility
US 5,458,923 · App. 08/305,046
Process for impregnating a building material with an organosilicon compound
Inventors:
Thomas Goebel, Rudolf Michel, Harald Alff, Josef Karl
Patented Case
View Patent ↗
Granted: Oct 17, 1995
Filed: Sep 13, 1994
Inventors
Thomas Goebel
Rudolf Michel
Harald Alff
Josef Karl
Assignee (at issue)
Degussa AG
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.