Abrasive tool making process – material – or composition – With inorganic material – Metal or metal oxide
Reexamination Certificate
2008-12-17
2011-10-11
Lorengo, Jerry A (Department: 1731)
Abrasive tool making process, material, or composition
With inorganic material
Metal or metal oxide
C428S142000, C428S148000, C428S402000
Reexamination Certificate
active
08034137
ABSTRACT:
Precursor alpha alumina abrasive particles in a mold are subjected to a drying process that cracks or fractures at least a majority of the precursor abrasive particles into at least two pieces thereby producing abrasive shards having a smaller size than the mold cavity from which they were made. The smaller abrasive shards, once formed, could be reassembled like jigsaw puzzle pieces to reproduce the original cavity shape of the mold from which they were made. The cracking or fracturing of the precursor abrasive particles is believed to occur by ensuring that the surface tension of the abrasive dispersion to the walls of the mold is greater than the internal attractive forces of the abrasive dispersion as the abrasive dispersion is dried within the mold cavity.
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Adefris Negus B.
Boden John T.
Culler Scott R.
Erickson Dwight D.
Haas John D.
3M Innovative Properties Company
Baum Scott A.
Christie Ross J
Lorengo Jerry A
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