Granted Patent
Utility
US 4,342,527 · App. 06/168,410
Support assembly for underground mine and tunnel roofs
Inventor:
Claude C. White
Patented Case
View Patent ↗
Granted: Aug 3, 1982
Filed: Jul 10, 1980
Inventor
Claude C. White
Assignee (at issue)
Birmingham Bolt Co., 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.