Granted Patent
Utility
US 6,513,469 · App. 10/093,512
Variable valve operating system of internal combustion engine
Inventors:
Makoto Nakamura, Naoki Okamoto, Shinichi Takemura
Patented Case
View Patent ↗
Granted: Feb 4, 2003
Filed: Mar 11, 2002
Inventors
Makoto Nakamura
Naoki Okamoto
Shinichi Takemura
Assignees (at issue)
Unisia Jecs Corporation
Nissan Motor 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.