Granted Patent
Utility
US 3,947,172 · App. 05/481,437
Apparatus for extruding plastic materials
Inventor:
Daryl L. Myers
Patented Case
View Patent ↗
Granted: Mar 30, 1976
Filed: Jun 20, 1974
Inventor
Daryl L. Myers
Assignee (at issue)
Western Electric Company, 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.