Granted Patent
Utility
US 4,277,450 · App. 06/101,479
Removal of sulfur dioxide from gas
Inventor:
Louis R. Dilworth
Patented Case
View Patent ↗
Granted: Jul 7, 1981
Filed: Dec 10, 1979
Inventor
Louis R. Dilworth
Assignee (at issue)
Allis-Chalmers 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.