Granted Patent
Utility
US 4,881,986 · App. 07/138,250
Method for producing a rare earth metal-iron-boron anisotropic sintered magnet from rapidly-quenched rare earth metal-iron-boron alloy ribbon-like flakes
Inventors:
Tadakuni Sato, Yuichi Tachiya
Patented Case
View Patent ↗
Granted: Nov 21, 1989
Filed: Nov 25, 1987
Inventors
Tadakuni Sato
Yuichi Tachiya
Assignee (at issue)
TOKIN 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.