Granted Patent
Utility
US 6,135,217 · App. 09/233,008
Converted dual-acting hydraulic drilling jar
Inventor:
Timothy L. Wilson
Patented Case
View Patent ↗
Granted: Oct 24, 2000
Filed: Jan 19, 1999
Inventor
Timothy L. Wilson
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.