Granted Patent
Utility
US 6,135,861 · App. 09/431,210
Shaft polishing method and a shaft produced thereby
Inventor:
Donald J. Schaack
Patented Case
View Patent ↗
Granted: Oct 24, 2000
Filed: Nov 1, 1999
Inventor
Donald J. Schaack
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.