Granted Patent
Utility
US 4,285,836 · App. 06/072,241
Impregnating solution for hydrotreating catalyst manufacture and production thereof
Inventors:
John J. Stanulonis, Joseph A. Tabacek, Roger F. Vogel
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: Sep 4, 1979
Inventors
John J. Stanulonis
Joseph A. Tabacek
Roger F. Vogel
Assignee (at issue)
Gulf Research & Development Company
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.