Granted Patent
Utility
US 5,326,486 · App. 07/950,838
Lubricating oil composition
Inventors:
Kinya Mizui, Kazuyuki Watanabe, Hidenori Kaya, Takashi Hayashi, Kenji Shimamoto, Masahide Tanaka, Kazunori Takahata
Patented Case
View Patent ↗
Granted: Jul 5, 1994
Filed: Sep 25, 1992
Inventors
Kinya Mizui
Kazuyuki Watanabe
Hidenori Kaya
Takashi Hayashi
Kenji Shimamoto
Masahide Tanaka
Kazunori Takahata
Assignee (at issue)
Mitsui Petrochemical Industries, Ltd.
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.