Granted Patent
Utility
US 4,428,759 · App. 06/458,047
Distillative separation employing bottom additives
Inventors:
James M. Ryan, John V. O'Brien
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Jan 14, 1983
Inventors
James M. Ryan
John V. O'Brien
Assignee (at issue)
Koch Process Systems, Inc.
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.