Granted Patent
Utility
US 4,483,645 · App. 06/349,006
Combination expansion shell and resin secured mine roof anchor assembly
Inventors:
Claude C. White, Frederick Carr
Patented Case
View Patent ↗
Granted: Nov 20, 1984
Filed: Feb 16, 1982
Inventors
Claude C. White
Frederick Carr
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.