Granted Patent
Utility
US 5,139,548 · App. 07/739,077
Gas liquefaction process control system
Inventors:
Yu-Nan Liu, Glenn E. Kinard, David Anthony Zagnoli
Patented Case
View Patent ↗
Granted: Aug 18, 1992
Filed: Jul 31, 1991
Inventors
Yu-Nan Liu
Glenn E. Kinard
David Anthony Zagnoli
Assignee (at issue)
Air Products and Chemicals, 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.