Granted Patent
Utility
US 4,482,014 · App. 06/397,680
Barrier tool for polished bore receptacle
Inventor:
Roger P. Allwin
Patented Case
View Patent ↗
Granted: Nov 13, 1984
Filed: Jul 12, 1982
Inventor
Roger P. Allwin
Assignee (at issue)
MWL Tool & Supply Company
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.