Granted Patent
Utility
US 6,332,932 · App. 09/551,392
Punch, powder pressing apparatus and powder pressing method
Inventors:
Seiichi Kohara, Shinji Kidowaki
Patented Case
View Patent ↗
Granted: Dec 25, 2001
Filed: Apr 18, 2000
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.