Granted Patent
Utility
US 4,978,439 · App. 07/311,830
Desulphurisation using solid sorbents
Inventors:
Peter John Herbert Carnell, Patrick J. Denny
Patented Case
View Patent ↗
Granted: Dec 18, 1990
Filed: Feb 17, 1989
Inventors
Peter John Herbert Carnell
Patrick J. Denny
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.