Granted Patent
Utility
US 4,028,747 · App. 05/670,990
Oil toilet
Inventor:
Leroy Newton
Patented Case
View Patent ↗
Granted: Jun 14, 1977
Filed: Mar 26, 1976
Inventor
Leroy Newton
Assignee (at issue)
Monogram Industries 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.