Granted Patent
Utility
US 6,779,606 · App. 10/267,461
Method and apparatus for heating drilling and/or completion fluids entering or leaving a well bore during oil and gas exploration and production
Inventor:
Perry A. Lopez
Patented Case
View Patent ↗
Granted: Aug 24, 2004
Filed: Oct 9, 2002
Inventor
Perry A. Lopez
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.