Granted Patent
Utility
US 6,656,417 · App. 09/883,231
Punch, powder pressing apparatus and powder pressing method
Inventors:
Seiichi Kohara, Shinji Kidowaki
Patented Case
View Patent ↗
Granted: Dec 2, 2003
Filed: Jun 19, 2001
Inventors
Seiichi Kohara
Shinji Kidowaki
Assignee (at issue)
Sumitomo Special Metals Co., Ltd.
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.