Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Reexamination Certificate
2004-02-20
2009-08-04
Barrera, Ramon M (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
C315S501000
Reexamination Certificate
active
07570142
ABSTRACT:
A permanent magnet for a particle accelerator and a magnetic field generator, in which Nd—Fe—B based magnets are used but are not demagnetized so easily even when exposed to a radiation, are provided. A permanent magnet for a particle accelerator is used in an environment in which the magnet is exposed to a radiation at an absorbed dose of at least 3,000 Gy. The magnet includes R (which is at least one of the rare-earth elements), B, TM (which is at least one transition element and includes Fe) and inevitably contained impurity elements. The magnet is a sintered magnet that has been magnetized to a permeance coefficient of 0.5 or more and that has a coercivity HcJof 1.6 MA/m or more.
REFERENCES:
patent: 2890348 (1959-06-01), Ohkawa
patent: H000591 (1989-03-01), Leupold
patent: 4995905 (1991-02-01), Sagawa
patent: 5292380 (1994-03-01), Tanigawa et al.
patent: 5347254 (1994-09-01), Leupold
patent: 5635889 (1997-06-01), Stelter
patent: 02-101146 (1990-04-01), None
patent: 02-114499 (1990-04-01), None
patent: 04-334899 (1992-11-01), None
patent: 06-260316 (1994-09-01), None
patent: 08-255726 (1996-10-01), None
patent: 10-270197 (1998-10-01), None
patent: 2001-028300 (2001-01-01), None
patent: 2002-299110 (2002-10-01), None
patent: 2003-305021 (2003-10-01), None
Lee, et al., Permanent magnet array for magnetic refrigerator, May 15, 2002, J. App. Phy., vol. 91, No. 10, pp. 8894-8896.
www.dextermag.com/Magnetic-Theory-Design.aspx.
OSHA Material Safety Data Sheet for Neodymium Series Rare Earth Magnet, Shin-Etsu Chemical Co.
Okuda et al.; “Effects of Electron-Beam and γ-Ray Irradiation On The Magnetic Flux of Nd-Fe-B and Sm-Co Permanent Magnets”; Nuclear Instruments and Methods in Physics Research B; vol. 94 (1994); pp. 227-230.
Ito et al.; “Magnetic Flux Loss In Rare-Earth Magnets Irradiated With 200 MeV Protons”; Nuclear Instruments and Methods in Physics Research B; vol. 183 (2001); pp. 323-328.
Official Communication issued in the corresponding International Application No. PCT/JP2004/002038, mailed Mar. 2, 2006.
Aoiki Masaaki
Kawakubo Tadamichi
Makita Ken
Murakami Kaichi
Nakamura Eiji
Barrera Ramon M
Hitachi Metals Ltd.
Keating & Bennett LLP
LandOfFree
Permanent magnet for particle beam accelerator and magnetic... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Permanent magnet for particle beam accelerator and magnetic..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Permanent magnet for particle beam accelerator and magnetic... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4108923