Granted Patent
Utility
US 5,947,719 · App. 08/857,532
Grate plate construction
Inventors:
Otto Heinemann, Hermann Niemerg, Norbert Bredenholler, Ludger Brentrup
Patented Case
View Patent ↗
Granted: Sep 7, 1999
Filed: May 16, 1997
Inventors
Otto Heinemann
Hermann Niemerg
Norbert Bredenholler
Ludger Brentrup
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.