Granted Patent
Utility
US 6,557,622 · App. 10/078,595
Differential quench method and apparatus
Inventors:
William R. Frank, Jonathan Dorricott, Laurie E. Collins, Joseph D. Russo, Robert J. Boecker, Brian H. Wales
Patented Case
View Patent ↗
Granted: May 6, 2003
Filed: Feb 19, 2002
Inventors
William R. Frank
Jonathan Dorricott
Laurie E. Collins
Joseph D. Russo
Robert J. Boecker
Brian H. Wales
Assignee (at issue)
IPSCO Enterprises, 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.