Granted Patent
Utility
US 4,686,874 · App. 06/812,232
Tamper-proof bolt and tamper-proof bolt-key combination
Inventors:
Durham S. McCauley, Miller G. McCalmon
Patented Case
View Patent ↗
Granted: Aug 18, 1987
Filed: Dec 23, 1985
Inventors
Durham S. McCauley
Miller G. McCalmon
Assignee (at issue)
McGard LLC
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.