Granted Patent
Utility
US 4,389,336 · App. 06/303,169
Preparation of naphthalene-oxidation catalyst by impregnation of silica with aqueous solution of VOC.sub.2 O.sub.4 --K.sub.2 SO.sub.4 --KHSO.sub.4
Inventors:
Philip H. Harju, Eugene A. Pasek
Patented Case
View Patent ↗
Granted: Jun 21, 1983
Filed: Sep 17, 1981
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.