Granted Patent
Utility
US 5,609,398 · App. 08/326,488
Twisted stem abrading tool and method of making
Inventors:
Rueben Brown Warner, James B. Tyler
Patented Case
View Patent ↗
Granted: Mar 11, 1997
Filed: Oct 20, 1994
Inventors
Rueben Brown Warner
James B. Tyler
Assignee (at issue)
Jason Incorporated
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.