Granted Patent
Utility
US 4,468,138 · App. 06/306,544
Manufacture of diamond bearings
Inventor:
Dave D. Nagel
Patented Case
View Patent ↗
Granted: Aug 28, 1984
Filed: Sep 28, 1981
Inventor
Dave D. Nagel
Assignee (at issue)
Maurer Engineering GmbH
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.