Granted Patent
Utility
US 6,409,276 · App. 09/540,044
Water-jet assisted drum-type mining system
Inventors:
Donald B. Sult, Jeffrey J. Schwoebel
Patented Case
View Patent ↗
Granted: Jun 25, 2002
Filed: Mar 31, 2000
Inventors
Donald B. Sult
Jeffrey J. Schwoebel
Assignee (at issue)
Amvest Systems Inc.
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.