Granted Patent
Utility
US 5,520,006 · App. 08/284,832
Airflow and defrosting system for refrigeration systems and apparatus
Inventor:
Richard Middleton
Patented Case
View Patent ↗
Granted: May 28, 1996
Filed: Aug 2, 1994
Inventor
Richard Middleton
Assignee (at issue)
Northfield Freezing Systems, 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.