Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Reexamination Certificate
2009-04-09
2010-10-12
Le, H. (Holly) T (Department: 1787)
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
C428S328000, C428S403000
Reexamination Certificate
active
07810587
ABSTRACT:
The invention relates to a drill bit containing tungsten carbide powder having powder particles which have a core of cast tungsten carbide and a shell of tungsten monocarbide.
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Nayak B B: “Enhancement in the microhardness of arc plasma melted tungsten carbide” Journal of Materials Science Kluwer Academic Publishers USA, vol. 38, No. 12, Jun. 15, 2003, p. 2717-2721, XP002318190 ISSN: 022-2461.
Gerk Christian
Wernicke Klause-Dieter
Connelly Bove Lodge & Hutz LLP
H.C. Starck GmbH
Le H. (Holly) T
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