Granted Patent
Utility
US 4,243,647 · App. 05/700,513
Process for removal of hydrogen sulfide from gas streams
Inventors:
Robert H. Hass, Rowland C. Hansford
Patented Case
View Patent ↗
Granted: Jan 6, 1981
Filed: Jun 28, 1976
Inventors
Robert H. Hass
Rowland C. Hansford
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.