Granted Patent
Utility
US 5,316,595 · App. 07/740,442
Process for producing magnets having improved corrosion resistance
Inventors:
Takaki Hamada, Tetsuji Hayakawa, Yutaka Matsuura
Patented Case
View Patent ↗
Granted: May 31, 1994
Filed: Aug 5, 1991
Inventors
Takaki Hamada
Tetsuji Hayakawa
Yutaka Matsuura
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.