Granted Patent
Utility
US 6,474,448 · App. 09/617,671
Modular lock for elevator doors
Inventor:
Roberto Zappa
Patented Case
View Patent ↗
Granted: Nov 5, 2002
Filed: Jul 17, 2000
Inventor
Roberto Zappa
Assignee (at issue)
Sematic Italia S.p.A.
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.