Granted Patent
Utility
US 4,687,429 · App. 06/852,076
Die head for converting a co-extruder apparatus
Inventor:
William J. Simelunas
Patented Case
View Patent ↗
Granted: Aug 18, 1987
Filed: Apr 14, 1986
Inventor
William J. Simelunas
Assignee (at issue)
Nabisco Brands, Inc.
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.