Granted Patent
Utility
US 5,555,867 · App. 08/312,919
Swirl flow precombustion chamber
Inventor:
Paul Douglas Freen
Patented Case
View Patent ↗
Granted: Sep 17, 1996
Filed: Sep 30, 1994
Inventor
Paul Douglas Freen
Assignee (at issue)
Cooper Cameron 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.