Granted Patent
Utility
US 4,840,432 · App. 07/076,155
Continuous miner with duct assembly
Inventors:
Maurice K. LeBegue, Henry E. Wilson
Patented Case
View Patent ↗
Granted: Jun 20, 1989
Filed: Jul 21, 1987
Inventors
Maurice K. LeBegue
Henry E. Wilson
Assignee (at issue)
Baker International 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.