Granted Patent
Utility
US 4,244,779 · App. 05/970,457
Method of treating spent pulping liquor in a fluidized bed reactor
Inventors:
Jorma Nieminen, Folke Engstrom
Patented Case
View Patent ↗
Granted: Jan 13, 1981
Filed: Dec 18, 1978
Inventors
Jorma Nieminen
Folke Engstrom
Assignee (at issue)
A. Ahlstrom Osakeyhtio
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.