Granted Patent
Utility
US 4,953,419 · App. 07/409,549
Ball screw return system
Inventor:
Theodore R. Schlenker
Patented Case
View Patent ↗
Granted: Sep 4, 1990
Filed: Sep 19, 1989
Inventor
Theodore R. Schlenker
Assignee (at issue)
DANA LIMITED
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.