Granted Patent
Utility
US 6,722,590 · App. 10/207,705
Sand/salt spreader
Inventors:
James A. Kost, Josh Vyrostek
Patented Case
View Patent ↗
Granted: Apr 20, 2004
Filed: Jul 26, 2002
Inventors
James A. Kost
Josh Vyrostek
Assignee (at issue)
Louis Berkman Company
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.