Compositions – Magnetic – With wax – bitumen – resin – or gum
Reexamination Certificate
2005-03-29
2005-03-29
Sheehan, John P (Department: 1742)
Compositions
Magnetic
With wax, bitumen, resin, or gum
C148S302000, C075S255000, C428S600000, C428S606000, C428S687000
Reexamination Certificate
active
06872326
ABSTRACT:
A method of manufacturing magnetic powder is disclosed. This method can provide magnetic powder from which a bonded magnet having excellent magnetic properties and reliability can be manufactured. A melt spinning apparatus1is provided with a tube2having a nozzle3at the bottom thereof, a coil4for heating the tube and a cooling roll5. The cooling roll5is constructed from a roll base51and a circumferential surface53in which gas flow passages54for expelling gas are formed. A melt spun ribbon8is formed by injecting the molten alloy6from the nozzle3so as to be collided with the circumferential surface53of the cooling roll5, so that the molten alloy6is cooled and then solidified. In this process, gas is likely to enter between a puddle7of the molten alloy6and the circumferential surface53, but such gas is expelled by means of the gas flow passages54. The magnetic powder is obtained by milling thus formed melt spun ribbon8. In this method, when the average pitch of these gas flow passages54is defined as Pμm and the average particle size of the magnetic powder is defined as Dμm, the relationship represented by the formula P<D is satisfied.
REFERENCES:
patent: 4212343 (1980-07-01), Narasimhan
patent: 4408653 (1983-10-01), Nienart et al.
patent: 4705095 (1987-11-01), Gaspar
patent: 4819712 (1989-04-01), Bartlett
patent: 4903751 (1990-02-01), Hackman
patent: 4934443 (1990-06-01), Honeycutt et al.
patent: 5665177 (1997-09-01), Fukuno et al.
patent: 5993939 (1999-11-01), Fukuno et al.
patent: 6648989 (2003-11-01), Arai et al.
patent: 0 52901480 (1993-03-01), None
patent: 0 936 633 (1999-08-01), None
patent: 2000077219 (2000-03-01), None
patent: 62-290857 (1987-12-01), None
patent: 64-042501 (1989-02-01), None
patent: 02-165849 (1990-06-01), None
patent: 05-062813 (1993-03-01), None
patent: 05-269549 (1993-10-01), None
patent: 5-269549 (1993-10-01), None
patent: 05-337611 (1993-12-01), None
patent: 08-215801 (1996-08-01), None
patent: 08-176648 (1996-09-01), None
patent: 09-271909 (1997-10-01), None
patent: 10-041114 (1998-02-01), None
patent: 10-317110 (1998-12-01), None
patent: 11-309549 (1999-11-01), None
patent: 2000-077219 (2000-03-01), None
patent: 2000-182814 (2000-06-01), None
patent: 2000-345313 (2000-12-01), None
patent: 2001-353560 (2001-12-01), None
patent: 2001-358004 (2001-12-01), None
patent: 2002-035899 (2002-02-01), None
Search Report for corresponding European Application No. 01118452.0.
Arai Akira
Kato Hiroshi
Seiko Epson Corporation
Sheehan John P
LandOfFree
Method of manufacturing magnetic powder, magnetic powder and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of manufacturing magnetic powder, magnetic powder and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of manufacturing magnetic powder, magnetic powder and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3372516