Granted Patent
Utility
US 4,528,277 · App. 06/566,277
Catalyst for oxidizing hydrogen sulfide
Inventors:
Robert H. Hass, John W. Ward
Patented Case
View Patent ↗
Granted: Jul 9, 1985
Filed: Dec 28, 1983
Inventors
Robert H. Hass
John W. Ward
Assignee (at issue)
Union Oil Company of California
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.