Granted Patent
Utility
US 4,387,771 · App. 06/261,091
Wellhead system for exploratory wells
Inventor:
Darrell L. Jones
Patented Case
View Patent ↗
Granted: Jun 14, 1983
Filed: Feb 17, 1981
Inventor
Darrell L. Jones
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.