Granted Patent
Utility
US 6,794,632 · App. 10/031,762
Soil compaction device having a light detector
Inventor:
Michael Steffen
Patented Case
View Patent ↗
Granted: Sep 21, 2004
Filed: Apr 25, 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.