Granted Patent
Utility
US 5,778,712 · App. 08/776,393
Cylinder lock/key combination, a key and a key blank therefor
Inventor:
Lars Wallden
Patented Case
View Patent ↗
Granted: Jul 14, 1998
Filed: Jan 28, 1997
Inventor
Lars Wallden
Assignee (at issue)
ASSA AB
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.