Granted Patent
Utility
US 6,077,985 · App. 09/266,214
Integrated deethanizer/ethylene fractionation column
Inventor:
Karl Stork
Patented Case
View Patent ↗
Granted: Jun 20, 2000
Filed: Mar 10, 1999
Inventor
Karl Stork
Assignee (at issue)
Kellogg Brown & Root LLC
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.