Granted Patent
Utility
US 5,664,424 · App. 08/686,712
Refrigerant handling system and method with air purge and multiple refrigerant capabilities
Inventor:
Daniel L. Olds
Patented Case
View Patent ↗
Granted: Sep 9, 1997
Filed: Jul 26, 1996
Inventor
Daniel L. Olds
Assignee (at issue)
SPX 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.