Granted Patent
Utility
US 6,367,553 · App. 09/571,787
Method and apparatus for controlling well pressure while undergoing wireline operations on subsea blowout preventers
Inventor:
Anthony R. Boyd
Patented Case
View Patent ↗
Granted: Apr 9, 2002
Filed: May 16, 2000
Inventor
Anthony R. Boyd
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.