Granted Patent
Utility
US 5,267,845 · App. 07/882,001
Apparatus for manufacturing expandable polystyrene (EPS) pellets
Inventors:
Erik T. Anderlind, Erik W. Wehtje
Patented Case
View Patent ↗
Granted: Dec 7, 1993
Filed: May 13, 1992
Inventors
Erik T. Anderlind
Erik W. Wehtje
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.