Granted Patent
Utility
US 5,238,657 · App. 07/862,380
Method and apparatus for purifying flue gases
Inventor:
Reijo Kuivalainen
Patented Case
View Patent ↗
Granted: Aug 24, 1993
Filed: Apr 2, 1992
Inventor
Reijo Kuivalainen
Assignee (at issue)
A. Ahlstrom 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.