Granted Patent
Utility
US 6,030,448 · App. 09/014,716
Method for producing cement clinker
Inventors:
Wilfried Kreft, Martin Uhde, Wolfgang Rother
Patented Case
View Patent ↗
Granted: Feb 29, 2000
Filed: Jan 28, 1998
Inventors
Wilfried Kreft
Martin Uhde
Wolfgang Rother
Assignee (at issue)
Krupp Polysius 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.