Granted Patent
Utility
US 6,557,822 · App. 09/717,574
Dynamically stable flow amplifying poppet valve
Inventor:
Kazunori Yoshino
Patented Case
View Patent ↗
Granted: May 6, 2003
Filed: Nov 21, 2000
Inventor
Kazunori Yoshino
Assignee (at issue)
Caterpillar Inc.
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.