Granted Patent
Utility
US 4,659,556 · App. 06/472,304
Single step purification of sulfur dioxide gas prepared by the combustion of sulfur containing compounds
Inventor:
Donald A. Eros
Patented Case
View Patent ↗
Granted: Apr 21, 1987
Filed: Mar 4, 1983
Inventor
Donald A. Eros
Assignee (at issue)
ALLIED CONSULTING, INC.
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.