Granted Patent
Utility
US 4,721,184 · App. 07/008,026
Oil control system
Inventor:
Brian D. Sowards
Patented Case
View Patent ↗
Granted: Jan 26, 1988
Filed: Jan 28, 1987
Inventor
Brian D. Sowards
Assignee (at issue)
Ingersoll-Rand 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.