Granted Patent
Utility
US 4,384,965 · App. 06/231,815
Method for the mechanical working of metals and lubricant concentrate
Inventors:
Karl M. E. Hellsten, Birgit Tora Gunvor Karlsson
Patented Case
View Patent ↗
Granted: May 24, 1983
Filed: Feb 5, 1981
Inventors
Karl M. E. Hellsten
Birgit Tora Gunvor Karlsson
Assignee (at issue)
Berol Kemi AB
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.