Granted Patent
Utility
US 4,800,637 · App. 07/129,572
Method of removing plugs
Inventor:
Mark A. Overbay
Patented Case
View Patent ↗
Granted: Jan 31, 1989
Filed: Dec 7, 1987
Inventor
Mark A. Overbay
Assignee (at issue)
Combustion Engineering, 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.