Granted Patent
Utility
US 4,969,930 · App. 07/476,045
Process for gasifying or combusting solid carbonaceous material
Inventor:
Olli Arpalahti
Patented Case
View Patent ↗
Granted: Nov 13, 1990
Filed: Feb 8, 1990
Inventor
Olli Arpalahti
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.