Granted Patent
Utility
US 4,460,784 · App. 06/415,273
Fluid-bed catalysts process for making maleic anhydride
Inventors:
Philip H. Harju, Eugene A. Pasek
Patented Case
View Patent ↗
Granted: Jul 17, 1984
Filed: Sep 7, 1982
Inventors
Philip H. Harju
Eugene A. Pasek
Assignee (at issue)
KOPPERS, INC.
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.