Granted Patent
Utility
US 4,450,857 · App. 06/291,661
Device for tapping and plugging a fluid conductor
Inventors:
John L. Baugh, James W. Montgomery
Patented Case
View Patent ↗
Granted: May 29, 1984
Filed: Aug 10, 1981
Inventors
John L. Baugh
James W. Montgomery
Assignee (at issue)
Hughes Tool Company LLC
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.