Compositions – Magnetic – Iron-oxygen compound containing
Reexamination Certificate
2005-02-22
2005-02-22
Koslow, C. Melissa (Department: 1755)
Compositions
Magnetic
Iron-oxygen compound containing
Reexamination Certificate
active
06858156
ABSTRACT:
A ferrite magnet having a basic composition represented by the following general formula: (A1−xRx)O.n[(Fe1−yMy)2O3] by atomic ratio, wherein A is Sr and/or Ba, R is at least one of rare earth elements including Y, M is at least one element selected from the group consisting of Co, Mn, Ni and Zn, and x, y and n are numbers meeting the conditions of 0.01≦x≦0.4, [x/(2.6n)]≦y≦[x/(1.6n)], and 5≦n≦6, and substantially having a magnetoplumbite crystal structure, is obtained by uniformly mixing a compound of Sr and/or Ba with an iron compound; calcining the resultant uniform mixture; adding a compound of the R element and/or the M element to the resultant calcined powder at a pulverization step thereof; and sintering the resultant mixture. The compound of the R element and/or the M element may be added at a percentage of more than 0 atomic % and 80 atomic % or less, on an element basis, at a mixing step before calcination.
REFERENCES:
patent: 4765920 (1988-08-01), Gattuso et al.
patent: 5958284 (1999-09-01), Takami et al.
patent: 6086781 (2000-07-01), Taguchi et al.
patent: 6248253 (2001-06-01), Taguchi et al.
patent: 6258290 (2001-07-01), Taguchi et al.
patent: 0 353 627 (1990-02-01), None
patent: 3 377 821 (1990-07-01), None
patent: 0 758 786 (1997-02-01), None
patent: 62-252325 (1987-04-01), None
patent: 62-119760 (1987-06-01), None
patent: 09-115715 (1997-02-01), None
patent: WO 9838654 (1998-03-01), None
patent: WO 9916087 (1999-04-01), None
“Synthesis and Characterization of Ferrate with Magnetoplumbite Structure”, H. Nakai et al.; presented in 1992 Annual Meeting of The Japan Ceramics Association held on May 20, 1992; The Collected Preliminary Papers Presented in 1992 Annual Meeting of The Japan Ceramics Association, p. 95(1992) (English translation thereof attached hereto).
“Invention of Ferrimagnets with the Structure of Magnetoplumbite and Garnet in Strong Pulse Magnetic Fields”, G.A. Smolenskii et al., Bulletin of the Academy of Sciences of the USSR (Physical Series), vol. 25, No. 11. pp. 1405-1408 (1961) (English translation of the corresponding paper appeared in “lzvestiya Akdemii Nauk USSR, Seriya fizicheskaya”).
Osamu Kimura et al.; Enhanced Dispersion Frequency of Hot-Pressed Z-Typc Magnctoplumbite Ferrite with the Composition 2CoO-cBa0.5Sr0.50-10.8Fe2O3; J. AM. Ceramic Society, vol. 78(10), 1995, pp. 2857-2860, XP002271908.
Kubota Yutaka
Ogata Yasunobu
Takami Takashi
Hitachi Metals Ltd.
Koslow C. Melissa
LandOfFree
Ferrite magnet and both rotor and magnet roll comprising the... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ferrite magnet and both rotor and magnet roll comprising the..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ferrite magnet and both rotor and magnet roll comprising the... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3506654