Granted Patent
Utility
US 6,152,668 · App. 09/586,155
Coal charging car for charging chambers in a coke-oven battery
Inventor:
Ralf Knoch
Patented Case
View Patent ↗
Granted: Nov 28, 2000
Filed: Jun 2, 2000
Inventor
Ralf Knoch
Assignee (at issue)
Thyssen Krupp Encoke 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.