Granted Patent
Utility
US 4,534,680 · App. 06/667,140
Combination expansion shell and resin secured mine roof anchor assembly
Inventors:
Claude C. White, Frederick Carr
Patented Case
View Patent ↗
Granted: Aug 13, 1985
Filed: Nov 1, 1984
Inventors
Claude C. White
Frederick Carr
Assignees (at issue)
Birmingham Bolt Co., Inc.
Jim Walter Resources, 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.