Granted Patent
Utility
US 6,508,994 · App. 09/712,189
Method and apparatus for cleaning flue gases
Inventors:
Stefan Ahman, Nils Bringfors
Patented Case
View Patent ↗
Granted: Jan 21, 2003
Filed: Nov 15, 2000
Inventors
Stefan Ahman
Nils Bringfors
Assignee (at issue)
ABB Fläkt AB
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.