Granted Patent
Utility
US 5,043,497 · App. 07/412,748
Lubricating oil for traction drives
Inventors:
Masayoshi Muraki, Hajime Yoshida, Koji Tsuchimoto
Patented Case
View Patent ↗
Granted: Aug 27, 1991
Filed: Sep 26, 1989
Inventors
Masayoshi Muraki
Hajime Yoshida
Koji Tsuchimoto
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.