Granted Patent
Utility
US 5,918,677 · App. 08/815,553
Method of and apparatus for installing the casing in a well
Inventor:
Philip Head
Patented Case
View Patent ↗
Granted: Jul 6, 1999
Filed: Mar 12, 1997
Inventor
Philip Head
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.