Granted Patent
Utility
US 5,597,016 · App. 08/481,555
Mechanical lockout for pressure responsive downhole tool
Inventors:
Kevin R. Manke, Paul D. Ringgenberg
Patented Case
View Patent ↗
Granted: Jan 28, 1997
Filed: Jun 7, 1995
Inventors
Kevin R. Manke
Paul D. Ringgenberg
Assignee (at issue)
Halliburton
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.