Granted Patent
Utility
US 4,459,812 · App. 06/474,164
Method and apparatus for liquid freezing
Inventor:
John Norton
Patented Case
View Patent ↗
Granted: Jul 17, 1984
Filed: Mar 10, 1983
Inventor
John Norton
Assignee (at issue)
Engineered Air Systems
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.