Granted Patent
Utility
US 4,374,033 · App. 06/274,827
Dispersant and lubricating oil containing the dispersant
Inventor:
Robert E. Malec
Patented Case
View Patent ↗
Granted: Feb 15, 1983
Filed: Jun 18, 1981
Inventor
Robert E. Malec
Assignee (at issue)
Edwin Cooper, 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.