Granted Patent
Utility
US 4,979,253 · App. 07/373,546
Hydraulic circuit for control of lip of vertically storing dock leveler
Inventor:
James C. Alexander
Patented Case
View Patent ↗
Granted: Dec 25, 1990
Filed: Jun 30, 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.