Granted Patent
Utility
US 4,664,901 · App. 06/708,141
Process for producing carbon black
Inventor:
E. Webb Henderson
Patented Case
View Patent ↗
Granted: May 12, 1987
Filed: Mar 4, 1985
Inventor
E. Webb Henderson
Assignee (at issue)
Phillips Petroleum 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.