Granted Patent
Utility
US 5,702,540 · App. 08/623,129
Vacuum carburizing method and device, and carburized products
Inventor:
Ken Kubota
Patented Case
View Patent ↗
Granted: Dec 30, 1997
Filed: Mar 28, 1996
Inventor
Ken Kubota
Assignee (at issue)
JH Corporation
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.