Granted Patent
Utility
US 5,010,225 · App. 07/408,074
Tool joint and method of hardfacing same
Inventor:
Frank J. Carlin
Patented Case
View Patent ↗
Granted: Apr 23, 1991
Filed: Sep 15, 1989
Inventor
Frank J. Carlin
Assignee (at issue)
Grant TFW, 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.