Granted Patent
Utility
US 5,573,790 · App. 08/251,956
Apparatus for manufacturing expandable polystyrene (EPS) pellets
Inventors:
Erik W. Wehtje, Erik T. Anderlind
Patented Case
View Patent ↗
Granted: Nov 12, 1996
Filed: Jun 1, 1994
Inventors
Erik W. Wehtje
Erik T. Anderlind
Assignee (at issue)
PolySource LLC
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.