Granted Patent
Utility
US 5,693,301 · App. 08/718,404
Method for removing sulphur dioxide from a gas
Inventor:
Stefan Ahman
Patented Case
View Patent ↗
Granted: Dec 2, 1997
Filed: Sep 30, 1996
Inventor
Stefan Ahman
Assignee (at issue)
ABB Flakt 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.