Granted Patent
Utility
US 6,010,988 · App. 09/152,308
Lubricating oil composition
Inventors:
Toru Matsuoka, Hisayuki Wada, Susumu Yoshida, Naozumi Arimoto
Patented Case
View Patent ↗
Granted: Jan 4, 2000
Filed: Sep 14, 1998
Inventors
Toru Matsuoka
Hisayuki Wada
Susumu Yoshida
Naozumi Arimoto
Assignee (at issue)
Mitsubishi Oil Co., 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.