Granted Patent
Utility
US 4,925,596 · App. 07/233,749
Lubricating oil composition containing molybdenum and zinc compounds for internal combustion engine
Inventors:
Yoshihiro Maeda, Kunihiko Hosonuma, Keiichi Tamura
Patented Case
View Patent ↗
Granted: May 15, 1990
Filed: Aug 18, 1988
Inventors
Yoshihiro Maeda
Kunihiko Hosonuma
Keiichi Tamura
Assignees (at issue)
Kyodo Oil Technical Research Center Co., Ltd.
Nippon Mining Company 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.