Granted Patent
Utility
US 5,711,769 · App. 08/525,235
Process for passivation of reactive coal char
Inventors:
Franklin G. Rinker, Deane A. Horne, Dennis W. Coolidge, Ernest P. Esztergar
Patented Case
View Patent ↗
Granted: Jan 27, 1998
Filed: Sep 8, 1995
Inventors
Franklin G. Rinker
Deane A. Horne
Dennis W. Coolidge
Ernest P. Esztergar
Assignee (at issue)
Tek-Kol
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.