Granted Patent
Utility
US 5,116,170 · App. 07/660,337
Drill jig for preparing a door to receive a cylindrical lock
Inventors:
Ralph P. Palmer, David A. Whitmoyer, Mark A. Shumaker
Patented Case
View Patent ↗
Granted: May 26, 1992
Filed: Feb 22, 1991
Inventors
Ralph P. Palmer
David A. Whitmoyer
Mark A. Shumaker
Assignee (at issue)
Best Lock Corporation
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.