Granted Patent
Utility
US 6,554,016 · App. 09/735,385
Rotating blowout preventer with independent cooling circuits and thrust bearing
Inventor:
Joseph Kinder
Patented Case
View Patent ↗
Granted: Apr 29, 2003
Filed: Dec 12, 2000
Inventor
Joseph Kinder
Assignee (at issue)
Northland Energy 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.