Granted Patent
Utility
US 6,817,421 · App. 10/437,158
Blowout preventer protector and method of using same
Inventor:
L. Murray Dallas
Patented Case
View Patent ↗
Granted: Nov 16, 2004
Filed: May 13, 2003
Inventor
L. Murray Dallas
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.