Metal treatment – Stock – Magnetic
Reexamination Certificate
2002-12-18
2008-10-28
Sheehan, John P. (Department: 1793)
Metal treatment
Stock
Magnetic
C148S101000, C148S539000, C164S463000, C164S114000
Reexamination Certificate
active
07442262
ABSTRACT:
Disclosed is a rare earth magnet in the R-T-B (rare earth element-transition metal-boron) system that is made from an improved composition and properties of main phase alloy in the R-T-B system containing Pr and a boundary alloy. Disclosed also is a manufacturing method of the rare earth magnet alloy flake by a strip casting method with improved rotating rollers such that the alloy flake has a specified fine surface roughness and has a small and regulated amount of fine R-rich phase regions. Consequently, the alloy flake for the rare earth magnet does not containing α-Fe and has a homogeneous morphology so that the rare earth magnet formed by sintering or bonding the alloy flakes exhibits excellent magnetic properties.
REFERENCES:
patent: 5431747 (1995-07-01), Takebuchi et al.
patent: 5486239 (1996-01-01), Nakayama et al.
patent: 5908513 (1999-06-01), Sasaki et al.
patent: 5948179 (1999-09-01), Hasegawa et al.
patent: 5963774 (1999-10-01), Sasaki et al.
patent: 6045629 (2000-04-01), Hasegawa et al.
patent: 6419723 (2002-07-01), Hirota et al.
patent: 6796363 (2004-09-01), Arai et al.
patent: 7014718 (2006-03-01), Hasegawa et al.
patent: 2002/0020472 (2002-02-01), Arai et al.
patent: 2002/0020514 (2002-02-01), Arai et al.
patent: 2002/0117235 (2002-08-01), Kanekiyo et al.
patent: 2004/0020569 (2004-02-01), Kanekiyo et al.
patent: 2005/0011588 (2005-01-01), Hasegawa et al.
patent: 2005/0028892 (2005-02-01), Sasaki
patent: 2005/0098238 (2005-05-01), Morimoto et al.
patent: 1166677 (1997-12-01), None
patent: 1326830 (2001-12-01), None
patent: 1329954 (2002-01-01), None
patent: 0595477 (1994-05-01), None
patent: 0237416 (1997-09-01), None
patent: 0801402 (1997-10-01), None
patent: 0886284 (1998-12-01), None
patent: 1 146 524 (2001-10-01), None
patent: 60-072648 (1985-04-01), None
patent: 62-206802 (1987-09-01), None
patent: 04-028457 (1992-01-01), None
patent: 05-222488 (1993-08-01), None
patent: 5-295490 (1993-11-01), None
patent: 6-151132 (1994-05-01), None
patent: 07-068351 (1995-03-01), None
patent: 08-150442 (1996-06-01), None
patent: 08-269643 (1996-10-01), None
patent: 09-001296 (1997-01-01), None
patent: 9-31609 (1997-02-01), None
patent: 09-045522 (1997-02-01), None
patent: 09-170055 (1997-06-01), None
patent: 9-271909 (1997-10-01), None
patent: 10-36949 (1998-02-01), None
patent: 2817624 (1998-08-01), None
patent: 10-317110 (1998-12-01), None
patent: 2001-59144 (2001-03-01), None
patent: 2001-244107 (2001-09-01), None
patent: 3234741 (2001-09-01), None
patent: 2001-358004 (2001-12-01), None
patent: 2002-059245 (2002-02-01), None
patent: 2002-59246 (2002-02-01), None
patent: 2003-188006 (2003-07-01), None
Kusunoki et al., “Highly Energy Product of Nd-Fe-B Magnet Sintered with Rare Earth Intemetallic Compounds,”T. IEEE Japan 113- A(12):849-853 (1993).
Itou et al., “Effects of Dry Compound Powder Addition on the Microstructures and the Magnetic Properties of Nd-Fe-B Sintered Magnets,”J. Japan Inst. Metals 59(1):103-107 (1995).
Takeshita et al., “Magnetic Properties and Microstructures of the NdFeB Magnet Powder Produced by Hydrogen Treatment,”Proc. 10thInt. Workshop on RE Magnets and their Application 1:551 (1989), Kyoto.
Sheehan John P.
Showa Denko K.K.
Sughrue & Mion, PLLC
LandOfFree
Alloy flake for rare earth magnet, production method... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Alloy flake for rare earth magnet, production method..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alloy flake for rare earth magnet, production method... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4009456