Granted Patent
Utility
US 6,651,608 · App. 10/182,032
Manually operated working device having a speed that is adjusted automatically
Inventor:
Michael Steffen
Patented Case
View Patent ↗
Granted: Nov 25, 2003
Filed: Jul 19, 2002
Inventor
Michael Steffen
Assignee (at issue)
Wacker Construction Equipment AG
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.