Granted Patent
Utility
US 5,931,393 · App. 08/874,799
Salt-sand spreader with liquid injector
Inventors:
Charles Alsip, John P. Ellingson, Harvey E. Hoffman, Jack D. Messner, David G. Trooien
Patented Case
View Patent ↗
Granted: Aug 3, 1999
Filed: Jun 13, 1997
Inventors
Charles Alsip
John P. Ellingson
Harvey E. Hoffman
Jack D. Messner
David G. Trooien
Assignee (at issue)
Iboco, 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.