Granted Patent
Utility
US 4,690,690 · App. 06/832,425
Steam reforming hydrocarbons
Inventors:
Sydney P. S. Andrew, Ralph J. Doy, Antony P. J. Limbach
Patented Case
View Patent ↗
Granted: Sep 1, 1987
Filed: Feb 24, 1986
Inventors
Sydney P. S. Andrew
Ralph J. Doy
Antony P. J. Limbach
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.