Granted Patent
Utility
US 6,644,358 · App. 09/933,475
Centrifugally-cast tube and related method and apparatus for making same
Inventors:
Joel Demarest, Gilles Verdier
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: Jul 27, 2001
Inventors
Joel Demarest
Gilles Verdier
Assignee (at issue)
Manoir Industries
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.