Granted Patent
Utility
US 4,928,340 · App. 07/315,060
Dock leveler
Inventor:
James C. Alexander
Patented Case
View Patent ↗
Granted: May 29, 1990
Filed: Feb 24, 1989
Inventor
James C. Alexander
Assignee (at issue)
Serco
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.