Granted Patent
Utility
US 4,247,233 · App. 06/034,447
Micro-adjustable boring bar
Inventor:
Rolf Kraemer
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: Apr 30, 1979
Inventor
Rolf Kraemer
Assignee (at issue)
Fansteel Inc.
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.