Granted Patent
Utility
US 5,267,788 · App. 07/856,126
Multi-screw, continuous mixing and kneading machine with polygonal kneading elements for plasticizable compounds
Inventor:
Siegward Rockstedt
Patented Case
View Patent ↗
Granted: Dec 7, 1993
Filed: Mar 23, 1992
Inventor
Siegward Rockstedt
Assignee (at issue)
Farrel Corporation
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.