Granted Patent
Utility
US 4,601,892 · App. 06/480,203
Process for producing carbon black
Inventors:
C. Jack Hart, Lawrence K. Murray, David L. Rogers, Richard T. Divis
Patented Case
View Patent ↗
Granted: Jul 22, 1986
Filed: Mar 30, 1983
Inventors
C. Jack Hart
Lawrence K. Murray
David L. Rogers
Richard T. Divis
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.