Granted Patent
Utility
US 6,718,692 · App. 10/135,101
Safety hatch for preventing fall-through and unauthorized entry
Inventor:
Timothy J. Mc Kernan
Patented Case
View Patent ↗
Granted: Apr 13, 2004
Filed: Apr 29, 2002
Inventor
Timothy J. Mc Kernan
Assignee (at issue)
Syracuse Castings Sale Corp.
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.