Granted Patent
Utility
US 5,137,402 · App. 07/750,346
Rotary ring cutter
Inventors:
Robert J. Ball, Keith F. Kleinstuber, Harry Pearson
Patented Case
View Patent ↗
Granted: Aug 11, 1992
Filed: Aug 27, 1991
Inventors
Robert J. Ball
Keith F. Kleinstuber
Harry Pearson
Assignee (at issue)
THE GLEASON WORKS
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.