Granted Patent
Utility
US 6,511,552 · App. 09/265,669
Permanent magnets and R-TM-B based permanent magnets
Inventors:
Ken Makita, Osamu Yamashita
Patented Case
View Patent ↗
Granted: Jan 28, 2003
Filed: Mar 10, 1999
Inventors
Ken Makita
Osamu Yamashita
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.