Granted Patent
Utility
US 4,278,372 · App. 06/098,936
Adjustable boring bar mechanism
Inventor:
Marvin M. Heisner
Patented Case
View Patent ↗
Granted: Jul 14, 1981
Filed: Nov 30, 1979
Inventor
Marvin M. Heisner
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.