Granted Patent
Utility
US 6,145,596 · App. 09/268,460
Method and apparatus for dual string well tree isolation
Inventor:
L. Murray Dallas
Patented Case
View Patent ↗
Granted: Nov 14, 2000
Filed: Mar 16, 1999
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.