Granted Patent
Utility
US 4,957,372 · App. 07/401,472
Means for improving the uniformity-performance of cold feed rubber-extruders
Inventor:
Paul Meyer
Patented Case
View Patent ↗
Granted: Sep 18, 1990
Filed: Aug 29, 1989
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.