Granted Patent
Utility
US 4,861,191 · App. 07/206,312
Road widener
Inventors:
Donald W. Smith, James J. Plociennik
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Jun 14, 1988
Inventors
Donald W. Smith
James J. Plociennik
Assignee (at issue)
Barber-Greene 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.