Granted Patent
Utility
US 4,834,543 · App. 07/180,779
Optimized four-wing, non-intermeshing rotors for synchronous drive at optimum phase relation in internal batch mixing machines
Inventor:
Narku O. Nortey
Patented Case
View Patent ↗
Granted: May 30, 1989
Filed: Apr 12, 1988
Inventor
Narku O. Nortey
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.