Granted Patent
Utility
US 5,187,899 · App. 07/454,290
High frequency vibrational polishing
Inventor:
Lawrence J. Rhoades
Patented Case
View Patent ↗
Granted: Feb 23, 1993
Filed: Dec 21, 1989
Inventor
Lawrence J. Rhoades
Assignee (at issue)
Extrude Hone GmbH
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.