Granted Patent
Utility
US 6,186,336 · App. 09/429,885
Dredge with auxiliary grizzly
Inventor:
Jochen Rohr
Patented Case
View Patent ↗
Granted: Feb 13, 2001
Filed: Oct 29, 1999
Inventor
Jochen Rohr
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.