Granted Patent
Utility
US 6,347,575 · App. 09/345,100
Low emission piston and ring for internal combustion engine
Inventor:
Benjamin V. Booher
Patented Case
View Patent ↗
Granted: Feb 19, 2002
Filed: Jun 30, 1999
Inventor
Benjamin V. Booher
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.