Granted Patent
Utility
US 5,439,286 · App. 08/189,180
Methods of constructing drive elements including paddle and shaft assemblies for twin screw mixer and/or processors and the resulting apparatus
Inventors:
James E. Kowalczyk, Bernard A. Loomans
Patented Case
View Patent ↗
Granted: Aug 8, 1995
Filed: Jan 31, 1994
Inventors
James E. Kowalczyk
Bernard A. Loomans
Assignee (at issue)
APV Chemical Machinery Inc.
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.