Granted Patent
Utility
US 4,247,420 · App. 06/023,429
Hydrocarbon conversion catalyst preparation
Inventors:
Joseph S. C. Dumoulin, Mark A. Seese, Edwin W. Albers
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: Mar 23, 1979
Inventors
Joseph S. C. Dumoulin
Mark A. Seese
Edwin W. Albers
Assignee (at issue)
W. R. Grace & Co.
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.