Granted Patent
Utility
US 5,404,792 · App. 08/166,025
Piston for internal combustion engine
Inventors:
Hiroaki Watanabe, Kazuhiko Shirane, Hideo Yoshimura
Patented Case
View Patent ↗
Granted: Apr 11, 1995
Filed: Dec 14, 1993
Inventors
Hiroaki Watanabe
Kazuhiko Shirane
Hideo Yoshimura
Assignee (at issue)
Unisia Jecs Corporation
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.