Granted Patent
Utility
US 4,462,692 · App. 06/490,647
Screw extruders
Inventor:
Paul Meyer
Patented Case
View Patent ↗
Granted: Jul 31, 1984
Filed: May 2, 1983
Inventor
Paul Meyer
Assignee (at issue)
Frenkel CD Ltd
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.