Granted Patent
Utility
US 4,981,532 · App. 07/234,405
Rare earth-iron-boron magnet powder and process of producing same
Inventors:
Takuo Takeshita, Ryoji Nakayama, Tamotsu Ogawa
Patented Case
View Patent ↗
Granted: Jan 1, 1991
Filed: Aug 19, 1988
Inventors
Takuo Takeshita
Ryoji Nakayama
Tamotsu Ogawa
Assignee (at issue)
Mitsubishi Kinzoku Kabushiki Kaisha
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.