Granted Patent
Utility
US 4,332,674 · App. 06/169,086
Method and apparatus for cracking residual oils
Inventors:
Robert R. Dean, Jean-Louis Mauleon, Robert W. Pfeiffer
Patented Case
View Patent ↗
Granted: Jun 1, 1982
Filed: Jul 15, 1980
Inventors
Robert R. Dean
Jean-Louis Mauleon
Robert W. Pfeiffer
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.