Granted Patent
Utility
US 5,186,769 · App. 07/751,078
Seamless steel tube manufacture
Inventors:
Patrick Hunt, John Jonas, Stephen Yue, George E. Ruddle, Lakshman N. Pussegoda
Patented Case
View Patent ↗
Granted: Feb 16, 1993
Filed: Jul 28, 1991
Inventors
Patrick Hunt
John Jonas
Stephen Yue
George E. Ruddle
Lakshman N. Pussegoda
Assignee (at issue)
Algoma Steel 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.