Granted Patent
Utility
US 5,560,709 · App. 08/555,662
Mixer drive apparatus enabling radial changing of shaft seal
Inventors:
William F. Hutchings, Marlin D. Schutte, Stephen L. Markle, Joel S. Berg, David Engel
Patented Case
View Patent ↗
Granted: Oct 1, 1996
Filed: Nov 13, 1995
Inventors
William F. Hutchings
Marlin D. Schutte
Stephen L. Markle
Joel S. Berg
David Engel
Assignee (at issue)
Federal Signal 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.