Abrading – Abrading process – Utilizing fluent abradant
Reexamination Certificate
2005-12-13
2005-12-13
Ackun, Jr., Jacob K. (Department: 3723)
Abrading
Abrading process
Utilizing fluent abradant
C451S041000, C428S690000
Reexamination Certificate
active
06974368
ABSTRACT:
A magnetic hard disk substrate is produced by rotating an aluminum substrate or a glass substrate, supplying polishing slurry on its surface, pressing a polishing tape on the surface and running it in a direction opposite to the direction of rotation of the substrate. Texturing marks are formed with a line density greater than 70 lines/μm in the radial direction on the surface. The polishing slurry has abrading particles dispersed in a dispersant. The abrading particles may be monocrystalline diamond particles, polycrystalline diamond particles or cluster particles with such monocrystalline and polycrystalline diamond particles with diameters in the range of 1-50 nm. Agglomerated particles of such cluster particles that are agglomerated in the dispersant may also be included as the abrading particles.
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patent: 2005/0008822 (2005-01-01), Miyamoto et al.
Horie Yuji
Okuyama Hiromitsu
Tanifuji Tatsuya
Ackun Jr. Jacob K.
Beyer Weaver & Thomas LLP
NIHON Microcoating Co., Ltd.
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