Granted Patent
Utility
US 4,879,004 · App. 07/190,080
Process for the extraction of oil or polychlorinated biphenyl from electrical parts through the use of solvents and for distillation of the solvents
Inventors:
Gustav Oesch, Paul Gmeiner, Urs Hofer
Patented Case
View Patent ↗
Granted: Nov 7, 1989
Filed: May 4, 1988
Inventors
Gustav Oesch
Paul Gmeiner
Urs Hofer
Assignee (at issue)
Micafil 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.