Granted Patent
Utility
US 5,285,587 · App. 08/038,467
Underwater mining dredge
Inventor:
Leo M. Krenzler
Patented Case
View Patent ↗
Granted: Feb 15, 1994
Filed: Mar 29, 1993
Inventor
Leo M. Krenzler
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.