Granted Patent
Utility
US 4,855,074 · App. 07/167,875
Homogeneous additive concentrates and their formation
Inventors:
Andrew G. Papay, Joseph P. O'Brien
Patented Case
View Patent ↗
Granted: Aug 8, 1989
Filed: Mar 14, 1988
Inventors
Andrew G. Papay
Joseph P. O'Brien
Assignee (at issue)
Ethyl Petroleum Additives, Inc.
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.