Granted Patent
Utility
US 4,120,174 · App. 05/778,216
Air defrost display case
Inventor:
William C. Johnston
Patented Case
View Patent ↗
Granted: Oct 17, 1978
Filed: Mar 16, 1977
Inventor
William C. Johnston
Assignee (at issue)
KYSOR INDUSTRIAL 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.