Granted Patent
Utility
US 5,188,177 · App. 07/730,668
Magnetic-pulse sealing of oil-well-head pipe
Inventor:
Randy D. Curry
Patented Case
View Patent ↗
Granted: Feb 23, 1993
Filed: Jul 16, 1991
Inventor
Randy D. Curry
Assignee (at issue)
TITAN COMPANY LIMITED
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.