Granted Patent
Utility
US 6,712,147 · App. 09/998,953
Spool for pressure containment used in rigless well completion, re-completion, servicing or workover
Inventor:
L. Murray Dallas
Patented Case
View Patent ↗
Granted: Mar 30, 2004
Filed: Nov 15, 2001
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.