Abrasive tool making process – material – or composition – Miscellaneous
Reexamination Certificate
2005-06-07
2009-06-30
Marcheschi, Michael A (Department: 1793)
Abrasive tool making process, material, or composition
Miscellaneous
C051S298000, C051S303000, C051S295000, C051S307000, C051S308000, C051S309000, C264S122000, C264S125000
Reexamination Certificate
active
07553344
ABSTRACT:
A new industrial thermally stable polycrystalline diamond (TSP) is disclosed and described as a replacement of natural as well as synthetic diamond grit in concrete cutting, grinding, polishing, and surface-set grinding or core bit drilling applications. Conventional diamond is too strong and brittle for self-sharpening and polishing and has a lower thermal stability inferior to the industrial standard for high temperature tool segment bonding. TSP grits can be tailor-made having unique properties as well as an engineered shape of grits over naturally or synthetically produced diamond grits. The TSP grits have a high thermal stability of up to 1200° C. and are self-sharpening. Further, economical production of coarse TSP grit size up to 1-2 mm from 50/60 mesh size in almost any preferred shape such as blocky, round, hexagonal, thin elongated, spherical, needle like, and any desirable tailor-made shaped etc can be realized. The use of a partition member during production of the TSP grits allows for the effective manufacturing of desired shaped grits as compared to laborious and ineffective low yield crushing of TSP material. Advantageously, the process time can also be exceptionally shorter than conventional HPHT processes.
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Agrawal, Dinesh, Dr. et al. Producing Advanced Drill Bit Cutters Using Microwave Technology, GasTIPS, Winter 2002 pp. 34-37.
Radtke, Robert et al. “Faster Drilling, Longer Life: Thermally Stable Diamond Drill Bit Cutters” GasTIPS, Summer 2004, pp. 5-9.
ADICO, Asia Polydiamond Company, Ltd.
Marcheschi Michael A
Thorpe North & Western LLP
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