Granted Patent
Utility
US 4,643,887 · App. 06/412,051
Production of sulfur trioxide, sulfuric acid and oleum
Inventors:
William D. Daley, James Jaffe
Patented Case
View Patent ↗
Granted: Feb 17, 1987
Filed: Aug 26, 1982
Inventors
William D. Daley
James Jaffe
Assignee (at issue)
General Chemical Company
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.