Granted Patent
Utility
US 5,667,450 · App. 08/489,582
Drive sprocket device
Inventor:
Arvo Leini
Patented Case
View Patent ↗
Granted: Sep 16, 1997
Filed: Jun 12, 1995
Inventor
Arvo Leini
Assignee (at issue)
SANDVIK 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.