Granted Patent
Utility
US 4,399,740 · App. 06/103,663
Fume hood with dual room air inlet systems
Inventor:
Jon A. Zboralski
Patented Case
View Patent ↗
Granted: Aug 23, 1983
Filed: Dec 14, 1979
Inventor
Jon A. Zboralski
Assignee (at issue)
Hamilton Industries
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.