Granted Patent
Utility
US 6,490,950 · App. 09/783,030
Process of making a set of distinguishable robertson driver bits
Inventors:
James C. Ray, Tom Rankin
Patented Case
View Patent ↗
Granted: Dec 10, 2002
Filed: Feb 15, 2001
Inventors
James C. Ray
Tom Rankin
Assignees (at issue)
Ray-Griffin, Inc.
ROBERTSON ASSOCIATES LLC
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.