Granted Patent
Utility
US 5,972,057 · App. 09/146,169
Method and apparatus for producing diesel fuel oil from waste edible oil
Inventors:
Shigeto Hayafuji, Takeo Shimidzu, Shosei Oh, Hiroaki Zaima
Patented Case
View Patent ↗
Granted: Oct 26, 1999
Filed: Sep 3, 1998
Inventors
Shigeto Hayafuji
Takeo Shimidzu
Shosei Oh
Hiroaki Zaima
Assignee (at issue)
Lonford Development Limited
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.