Granted Patent
Utility
US 6,481,993 · App. 09/669,576
Process and apparatus for supplying rare earth metal-based alloy powder
Inventors:
Seiichi Kohara, Shuhei Okumura, Akira Nakamura
Patented Case
View Patent ↗
Granted: Nov 19, 2002
Filed: Sep 26, 2000
Inventors
Seiichi Kohara
Shuhei Okumura
Akira Nakamura
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.