Granted Patent
Utility
US 6,644,479 · App. 09/937,861
Method and air separator for classifying charging material reduced in size
Inventors:
Ludger Kimmeyer, Robert Schnatz
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: Apr 10, 2002
Inventors
Ludger Kimmeyer
Robert Schnatz
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.