Granted Patent
Utility
US 4,462,691 · App. 06/457,793
Mixer/extruder having selectively variable shearing action therein
Inventor:
Jan J. Boguslawski
Patented Case
View Patent ↗
Granted: Jul 31, 1984
Filed: Jan 13, 1983
Inventor
Jan J. Boguslawski
Assignee (at issue)
Uniroyal 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.