Granted Patent
Utility
US 5,171,186 · App. 07/681,121
Method of manufacture of a long point drill screw
Inventor:
Richard W. Lukes
Patented Case
View Patent ↗
Granted: Dec 15, 1992
Filed: Apr 5, 1991
Inventor
Richard W. Lukes
Assignee (at issue)
Textron 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.