Granted Patent
Utility
US 4,559,065 · App. 06/590,013
Twin tower gas fractionation apparatus
Inventors:
Robert A. Null, Lonnie C. Laughlin, Michael Goldberg
Patented Case
View Patent ↗
Granted: Dec 17, 1985
Filed: Mar 15, 1984
Inventors
Robert A. Null
Lonnie C. Laughlin
Michael Goldberg
Assignee (at issue)
Wilkerson 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.