Specialized metallurgical processes – compositions for use therei – Compositions – Loose particulate mixture containing metal particles
Reexamination Certificate
2005-01-18
2005-01-18
Mai, Ngoclan T. (Department: 1742)
Specialized metallurgical processes, compositions for use therei
Compositions
Loose particulate mixture containing metal particles
C075S245000, C361S528000
Reexamination Certificate
active
06843825
ABSTRACT:
A niobium primary powder having an average particle size of 0.01 to 0.5 μm and an average circular degree of 0.8 or more, the circular degree being defined by 4 πA/L2(wherein A is an area of a solid projected on a plain face and L is an outer circumferential length of the projection view); a niobium primary agglomerated powder having an average particle size of 0.03 to 20 μm, which is an agglomerate of the niobium primary powder; a niobium secondary agglomerated powder having an average particle size of 50 to 150 μm, which is obtained by granulating the primary agglomerated powder; a sintered body of the niobium primary agglomerated powder or niobium secondary agglomerated powder; and a capacitor using the sintered body. By using sintered bodies of the niobium primary agglomerated powder or niobium secondary agglomerated powder, a capacitor having a large capacitance per unit volume and good voltage resistance can be manufactured.
REFERENCES:
patent: 3630718 (1971-12-01), Neuenschwander
patent: 4954169 (1990-09-01), Behrens
patent: 5984997 (1999-11-01), Bickmore et al.
patent: 6051044 (2000-04-01), Fife
patent: 6115235 (2000-09-01), Naito
patent: 6521013 (2003-02-01), Naito et al.
patent: 0 825 626 (1998-02-01), None
Internationals Search Report for PCT/JP01/09375 dated Nov. 11, 2002.
Nagato Nobuyuki
Naito Kazumi
Mai Ngoclan T.
Showa Denko K.K.
Sughrue & Mion, PLLC
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