Granted Patent
Utility
US 4,446,070 · App. 06/272,414
Catalytic oxidation of polynuclear aromatic hydrocarbons
Inventors:
Derk T. A. Huibers, Cheng Yih Jenq
Patented Case
View Patent ↗
Granted: May 1, 1984
Filed: Jun 10, 1981
Inventors
Derk T. A. Huibers
Cheng Yih Jenq
Assignee (at issue)
HRI
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.