Granted Patent
Utility
US 6,545,231 · App. 09/720,831
Chain conveyor
Inventor:
Hans W. Hafner
Patented Case
View Patent ↗
Granted: Apr 8, 2003
Filed: Dec 28, 2000
Inventor
Hans W. Hafner
Assignee (at issue)
Pfister 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.