Granted Patent
Utility
US 5,336,375 · App. 08/168,063
Delayed coker drumhead handling apparatus
Inventors:
Harvey A. Wallskog, Frank L. Landon, William R. Ruble
Patented Case
View Patent ↗
Granted: Aug 9, 1994
Filed: Dec 15, 1993
Inventors
Harvey A. Wallskog
Frank L. Landon
William R. Ruble
Assignee (at issue)
Fluor Corporation
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.