Granted Patent
Utility
US 5,370,218 · App. 08/123,379
Apparatus for hauling coal through a mine
Inventors:
George F. Johnson, Jr., Arnemann R. Grender
Patented Case
View Patent ↗
Granted: Dec 6, 1994
Filed: Sep 17, 1993
Inventors
George F. Johnson, Jr.
Arnemann R. Grender
Assignee (at issue)
Johnson Industries, 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.