Granted Patent
Utility
US 5,407,252 · App. 08/299,597
Method and apparatus for scaling mine roofs and ribs
Inventor:
Huey P. Perero
Patented Case
View Patent ↗
Granted: Apr 18, 1995
Filed: Sep 1, 1994
Inventor
Huey P. Perero
Assignee (at issue)
Carey Salt Company, 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.