Granted Patent
Utility
US 4,936,057 · App. 06/773,540
Method of finish machining the surface of irregularly shaped fluid passages
Inventor:
Lawrence J. Rhoades
Patented Case
View Patent ↗
Granted: Jun 26, 1990
Filed: Sep 9, 1985
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.