Granted Patent
Utility
US 5,145,236 · App. 07/695,875
Method and apparatus for controlling dust produced by a continuous miner
Inventors:
Chung F. Liao, George W. Graham
Patented Case
View Patent ↗
Granted: Sep 8, 1992
Filed: May 6, 1991
Inventors
Chung F. Liao
George W. Graham
Assignee (at issue)
SHELL OIL COMPANY
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.