Granted Patent
Utility
US 6,557,640 · App. 09/588,946
Lubrication and self-cleaning system for expansion mandrel
Inventors:
Robert Lance Cook, David Paul Brisco, R. Bruce Stewart, Reece E. Wyant, Lev Ring, James J. W. Nahm, Richard Carl Haut, Robert Donald Mack, Alan B. Duell, Andrei Gregory Filippov
Patented Case
View Patent ↗
Granted: May 6, 2003
Filed: Jun 7, 2000
Inventors
Robert Lance Cook
David Paul Brisco
R. Bruce Stewart
Reece E. Wyant
Lev Ring
James J. W. Nahm
Richard Carl Haut
Robert Donald Mack
Alan B. Duell
Andrei Gregory Filippov
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.