Granted Patent
Utility
US 6,276,168 · App. 09/566,075
Purification of nitrogen trifluoride by continuous cryogenic distillation
Inventors:
Zbigniew Tadeusz Fidkowski, John Frederick Cirucci, Rakesh Agrawal, Shyam Ramchand Suchdeo, Steven R. Auvil
Patented Case
View Patent ↗
Granted: Aug 21, 2001
Filed: May 8, 2000
Inventors
Zbigniew Tadeusz Fidkowski
John Frederick Cirucci
Rakesh Agrawal
Shyam Ramchand Suchdeo
Steven R. Auvil
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.