Granted Patent
Utility
US 4,648,821 · App. 06/646,683
Apparatus for co-extrusion of a dough mass having dissimilar inner and outer portions
Inventor:
Robert R. Thulin
Patented Case
View Patent ↗
Granted: Mar 10, 1987
Filed: Aug 31, 1984
Inventor
Robert R. Thulin
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.