Abrasive tool making process – material – or composition – With inorganic material
Reexamination Certificate
2007-12-04
2007-12-04
Marcheschi, Michael (Department: 1755)
Abrasive tool making process, material, or composition
With inorganic material
C451S028000, C451S036000, C451S041000, C451S038000, C451S042000, C216S096000
Reexamination Certificate
active
10422273
ABSTRACT:
An unexpanded perlite ore polishing composition is shown. The composition comprises base material having grains of unexpanded perlite ore of a selected distribution of particle sizes which undergo fracturing of the grains as a function of an abrasive force applied to the base material. The selected distribution of particle sizes includes a significant volume of grains of unexpanded perlite ore having a (d90) particle size in a range of about 101 to about 229 μm. The base material is responsive to an abrasive force being applied thereto during polishing resulting in continued fracturing of the grains of unexpanded perlite ore to yield a final polishing composition having a sufficiently low level of abrasiveness under said abrasive force making it suitable for use in polishing. Compositions for polishing acrylic dentures and CRT tube surfaces using the unexpanded perlite ore polishing composition and methods for polishing the same are also shown.
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Klein Dean
Roulston John S.
Advanced Minerals Corporation
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Marcheschi Michael
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