Granted Patent
Utility
US 4,551,087 · App. 06/619,043
Extrusion apparatus
Inventors:
Ali Pan, Karl S. Cohrs
Patented Case
View Patent ↗
Granted: Nov 5, 1985
Filed: Jun 11, 1984
Inventors
Ali Pan
Karl S. Cohrs
Assignee (at issue)
Nortel Networks Limited
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.