Granted Patent
Utility
US 6,726,849 · App. 10/177,475
Method of dusting coal mine surfaces
Inventors:
Frank T. Gay, Dontave Cowsette, Jeffrey Champa, Bradley Hulvey
Patented Case
View Patent ↗
Granted: Apr 27, 2004
Filed: Jun 21, 2002
Inventors
Frank T. Gay
Dontave Cowsette
Jeffrey Champa
Bradley Hulvey
Assignee (at issue)
CONSTRUCTION RESEARCH & TECHNOLOGY GMBH
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.