Granted Patent
Utility
US 4,694,989 · App. 06/938,576
Control installation for variable volume air diffusers
Inventors:
Melvin C. Carlson, Raymond H. Dean
Patented Case
View Patent ↗
Granted: Sep 22, 1987
Filed: Dec 5, 1986
Inventors
Melvin C. Carlson
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.