Granted Patent
Utility
US 4,227,381 · App. 06/020,026
Wind tunnel freezer
Inventors:
John J. Sullivan, Eugene D. Prine
Patented Case
View Patent ↗
Granted: Oct 14, 1980
Filed: Mar 13, 1979
Inventors
John J. Sullivan
Eugene D. Prine
Assignee (at issue)
W. R. Grace & Co.
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.