Granted Patent
Utility
US 6,719,625 · App. 10/252,278
Method and apparatus for controlling variable air volume supply fans in heating, ventilating, and air-conditioning systems
Inventor:
Clifford C. Federspiel
Patented Case
View Patent ↗
Granted: Apr 13, 2004
Filed: Sep 23, 2002
Inventor
Clifford C. Federspiel
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.