Granted Patent
Utility
US 5,439,331 · App. 08/220,730
High pressure tapping apparatus
Inventors:
Bill D. Andrew, William D. Duwe, Michael L. Wilson
Patented Case
View Patent ↗
Granted: Aug 8, 1995
Filed: Mar 31, 1994
Inventors
Bill D. Andrew
William D. Duwe
Michael L. Wilson
Assignee (at issue)
TDW Delaware, Inc.
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.