Granted Patent
Utility
US 5,072,991 · App. 07/571,778
Floating grab dredge and unloading method therefor
Inventor:
Jochen Rohr
Patented Case
View Patent ↗
Granted: Dec 17, 1991
Filed: Aug 24, 1990
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.