Granted Patent
Utility
US 5,993,570 · App. 08/879,331
Linepipe and structural steel produced by high speed continuous casting
Inventor:
John Gray
Patented Case
View Patent ↗
Granted: Nov 30, 1999
Filed: Jun 20, 1997
Inventor
John Gray
Assignee (at issue)
AMERICAN Cast Iron Pipe 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.