Granted Patent
Utility
US 5,871,638 · App. 08/742,541
Dispersed anion-modified phosphorus-promoted iron oxide catalysts
Inventors:
Vivek R. Pradhan, Alfred G. Comolli, Lap-Keung Lee
Patented Case
View Patent ↗
Granted: Feb 16, 1999
Filed: Nov 1, 1996
Inventors
Vivek R. Pradhan
Alfred G. Comolli
Lap-Keung Lee
Assignee (at issue)
Hydrocarbon Technologies
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.