Granted Patent
Utility
US 5,228,930 · App. 07/560,594
Rare earth permanent magnet power, method for producing same and bonded magnet
Inventors:
Ryoji Nakayama, Takuo Takeshita, Tamotsu Ogawa
Patented Case
View Patent ↗
Granted: Jul 20, 1993
Filed: Jul 31, 1990
Inventors
Ryoji Nakayama
Takuo Takeshita
Tamotsu Ogawa
Assignee (at issue)
MITSUBISHI MATERIALS CORPORATION
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.