Granted Patent
Utility
US 6,007,157 · App. 09/067,185
Slidably displaceable duct assembly for a mining machine
Inventor:
Christopher George Stewart
Patented Case
View Patent ↗
Granted: Dec 28, 1999
Filed: Apr 27, 1998
Inventor
Christopher George Stewart
Assignee (at issue)
Joy MM Delaware, Inc.
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.