Granted Patent
Utility
US 5,597,235 · App. 08/339,969
Twin screw extruder for processing elastomeric compositions
Inventors:
Roger P. Barnes, Jonathan A. Johnston
Patented Case
View Patent ↗
Granted: Jan 28, 1997
Filed: Nov 15, 1994
Inventors
Roger P. Barnes
Jonathan A. Johnston
Assignee (at issue)
Gates 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.