Granted Patent
Utility
US 4,623,448 · App. 06/710,843
Removing halogenated polyphenyl materials from used oil products
Inventors:
John P. O'Connell, John F. Wozniak
Patented Case
View Patent ↗
Granted: Nov 18, 1986
Filed: Mar 12, 1985
Inventors
John P. O'Connell
John F. Wozniak
Assignee (at issue)
Moreco Energy, Inc.
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.