Granted Patent
Utility
US 6,814,268 · App. 10/149,563
Crack resistant valve plate for a slide gate valve
Inventors:
Hans Rothfuss, Vincent Boisdequin
Patented Case
View Patent ↗
Granted: Nov 9, 2004
Filed: Jun 10, 2002
Inventors
Hans Rothfuss
Vincent Boisdequin
Assignee (at issue)
VESUVIUS CRUCIBLE 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.