Granted Patent
Utility
US 4,357,745 · App. 06/244,351
Method of welding lined pipe
Inventor:
Edmund M. Chlebowski
Patented Case
View Patent ↗
Granted: Nov 9, 1982
Filed: Mar 16, 1981
Inventor
Edmund M. Chlebowski
Assignee (at issue)
Uniroyal Ltd.
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.