Granted Patent
Utility
US 6,793,876 · App. 10/677,137
Production process for Fe-based sintered alloy valve seat
Inventors:
Atsushi Kawakami, Kazuyuki Hoshino, Kunio Hanata
Patented Case
View Patent ↗
Granted: Sep 21, 2004
Filed: Sep 30, 2003
Inventors
Atsushi Kawakami
Kazuyuki Hoshino
Kunio Hanata
Assignee (at issue)
MITSUBISHI MATERIALS 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.