Granted Patent
Utility
US 5,364,421 · App. 07/738,406
Coal blends having improved ash viscosity
Inventors:
Timothy S. Westby, Thomas G. McCord, Lynton W. R. Dicks
Patented Case
View Patent ↗
Granted: Nov 15, 1994
Filed: Jul 31, 1991
Inventors
Timothy S. Westby
Thomas G. McCord
Lynton W. R. Dicks
Assignee (at issue)
Ziegler Coal Holding 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.