Granted Patent
Utility
US 4,929,255 · App. 07/235,077
Method for gasifying or combusting solid carbonaceous material
Inventors:
Bertel K. Hakulin, Jorma Nieminen
Patented Case
View Patent ↗
Granted: May 29, 1990
Filed: Aug 23, 1988
Inventors
Bertel K. Hakulin
Jorma Nieminen
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.