Granted Patent
Utility
US 6,415,628 · App. 09/911,766
System for providing direct contact refrigeration
Inventors:
M. Mushtaq Ahmed, Theodore F. Fisher
Patented Case
View Patent ↗
Granted: Jul 9, 2002
Filed: Jul 25, 2001
Inventors
M. Mushtaq Ahmed
Theodore F. Fisher
Assignee (at issue)
Praxair Technology, 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.