Granted Patent
Utility
US 5,147,447 · App. 07/460,079
Sintered rare earth metal-boron-iron alloy magnets and a method for their production
Inventors:
Takuo Takeshita, Muneaki Watanabe
Patented Case
View Patent ↗
Granted: Sep 15, 1992
Filed: Feb 2, 1990
Inventors
Takuo Takeshita
Muneaki Watanabe
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.