Granted Patent
Utility
US 4,522,649 · App. 06/555,252
Method of furnace operation with high pellet burdens
Inventors:
Melvin C. Chang, John L. Howell
Patented Case
View Patent ↗
Granted: Jun 11, 1985
Filed: Nov 25, 1983
Inventors
Melvin C. Chang
John L. Howell
Assignee (at issue)
United States Steel Corporation
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.