Granted Patent
Utility
US 4,308,221 · App. 06/088,819
Apparatus for mixing a gas and a liquid
Inventor:
Daniel Durda
Patented Case
View Patent ↗
Granted: Dec 29, 1981
Filed: Oct 26, 1979
Inventor
Daniel Durda
Assignee (at issue)
Aeration Industries, 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.