Granted Patent
Utility
US 4,325,809 · App. 06/177,321
Hydrocarbon processing
Inventor:
David B. Bartholic
Patented Case
View Patent ↗
Granted: Apr 20, 1982
Filed: Aug 8, 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.