Granted Patent
Utility
US 4,512,299 · App. 06/560,762
Automotive engine with improved multifilter lubrication system
Inventors:
John J. Egan, Andrew B. Witkowski
Patented Case
View Patent ↗
Granted: Apr 23, 1985
Filed: Dec 12, 1983
Inventors
John J. Egan
Andrew B. Witkowski
Assignee (at issue)
International Harvester 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.