Granted Patent
Utility
US 6,220,190 · App. 09/232,090
Water-cooled oscillating grate system
Inventors:
George D. Dumbaugh, Kevin Toupin
Patented Case
View Patent ↗
Granted: Apr 24, 2001
Filed: Jan 15, 1999
Inventors
George D. Dumbaugh
Kevin Toupin
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.