Granted Patent
Utility
US 4,309,274 · App. 06/139,043
Preparation of FCC charge from residual fractions
Inventor:
David B. Bartholic
Patented Case
View Patent ↗
Granted: Jan 5, 1982
Filed: Apr 10, 1980
Inventor
David B. Bartholic
Assignee (at issue)
Engelhard Minerals & Chemicals Corporation
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.