Granted Patent
Utility
US 5,572,968 · App. 08/499,993
Internal-combustion engine having an oil return system
Inventors:
Hans-Joachim Esch, Albrecht Reustle, Winifried Distelrath
Patented Case
View Patent ↗
Granted: Nov 12, 1996
Filed: Jul 10, 1995
Inventors
Hans-Joachim Esch
Albrecht Reustle
Winifried Distelrath
Assignee (at issue)
Dr. Ing. h.c. F. Porsche Aktiengesellschaft
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.