Granted Patent
Utility
US 4,089,628 · App. 05/658,741
Pulverized coal arc heated igniter system
Inventor:
Philip R. Blackburn
Patented Case
View Patent ↗
Granted: May 16, 1978
Filed: Feb 17, 1976
Inventor
Philip R. Blackburn
Assignee (at issue)
Union Carbide 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.