Granted Patent
Utility
US 6,536,252 · App. 10/078,751
Non-metallic hydraulic expansion mandrel
Inventor:
Thomas Waring
Patented Case
View Patent ↗
Granted: Mar 25, 2003
Filed: Feb 19, 2002
Inventor
Thomas Waring
Assignee (at issue)
Babcock & Wilcox Canada Corp.
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.