Granted Patent
Utility
US 4,977,635 · App. 07/373,547
Control circuit for vertically storing dock leveler
Inventor:
James C. Alexander
Patented Case
View Patent ↗
Granted: Dec 18, 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.