Granted Patent
Utility
US 4,366,049 · App. 06/192,561
Process for recycling of used lubricating oils
Inventors:
Helmut Knorre, Manfred Langer, Friedrich Fauser, Willi Fischer
Patented Case
View Patent ↗
Granted: Dec 28, 1982
Filed: Sep 30, 1980
Inventors
Helmut Knorre
Manfred Langer
Friedrich Fauser
Willi Fischer
Assignees (at issue)
Leybold-Heraeus GmbH
Degussa AG
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.