Granted Patent
Utility
US 6,435,216 · App. 09/756,425
Choke restrictor devices and methods
Inventor:
Stephen McCulloch
Patented Case
View Patent ↗
Granted: Aug 20, 2002
Filed: Jan 8, 2001
Inventor
Stephen McCulloch
Assignee (at issue)
Wood Group Pressure Control Limited
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.