Granted Patent
Utility
US 5,984,594 · App. 09/087,781
Drill rig and method of use for forming holes in drill resistant materials
Inventors:
Ernest M. Osborne, Michael Osborne
Patented Case
View Patent ↗
Granted: Nov 16, 1999
Filed: May 29, 1998
Inventors
Ernest M. Osborne
Michael Osborne
Assignee (at issue)
Lockmasters, 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.