Granted Patent
Utility
US 5,730,474 · App. 08/627,730
Pipe joint and pipe for use therewith
Inventor:
Michael Bank
Patented Case
View Patent ↗
Granted: Mar 24, 1998
Filed: Apr 2, 1996
Inventor
Michael Bank
Assignee (at issue)
The Lamson & Sessions Co.
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.