Granted Patent
Utility
US 5,139,765 · App. 07/707,230
Dual combustion zone sulfur recovery process
Inventor:
Andrew Geza Szekely
Patented Case
View Patent ↗
Granted: Aug 18, 1992
Filed: May 24, 1991
Inventor
Andrew Geza Szekely
Assignee (at issue)
Union Carbide Industrial Gases Technology 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.