Granted Patent
Utility
US 5,413,004 · App. 08/253,430
Method and apparatus for sampling coal
Inventors:
George F. Johnson, Jr., Arnemann R. Gredner
Patented Case
View Patent ↗
Granted: May 9, 1995
Filed: Jun 2, 1994
Inventors
George F. Johnson, Jr.
Arnemann R. Gredner
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.