Granted Patent
Utility
US 5,657,643 · App. 08/607,942
Closed loop single mixed refrigerant process
Inventor:
Brian C. Price
Patented Case
View Patent ↗
Granted: Aug 19, 1997
Filed: Feb 28, 1996
Inventor
Brian C. Price
Assignee (at issue)
The Pritchard 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.