Granted Patent
Utility
US 4,399,739 · App. 06/217,049
Noise attenuating apparatus for modulating air flow
Inventor:
Raymond H. Dean
Patented Case
View Patent ↗
Granted: Aug 23, 1983
Filed: Dec 16, 1980
Inventor
Raymond H. Dean
Assignee (at issue)
Tempmaster 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.