Granted Patent
Utility
US 6,766,772 · App. 10/276,591
Apparatus for heating steam
Inventors:
Franciscus Gerardus Van Dongen, Johannes Didericus De Graaf
Patented Case
View Patent ↗
Granted: Jul 27, 2004
Filed: Nov 18, 2002
Inventors
Franciscus Gerardus Van Dongen
Johannes Didericus De Graaf
Assignee (at issue)
SHELL OIL 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.