Granted Patent
Utility
US 6,187,111 · App. 09/261,168
Vacuum carburizing method
Inventors:
Masaomi Waka, Toru Kadono, Satoshi Harai, Tetsuya Okada, Naoaki Imai
Patented Case
View Patent ↗
Granted: Feb 13, 2001
Filed: Mar 3, 1999
Inventors
Masaomi Waka
Toru Kadono
Satoshi Harai
Tetsuya Okada
Naoaki Imai
Assignee (at issue)
NACHI-FUJIKOSHI CORP.
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.