Monolithic roof cutting bit insert
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Mar 1, 2005
Grant Date -
Dec 26, 2002
app pub date -
Jun 25, 2001
filing date -
Jun 25, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary drill bit for penetrating earth strata wherein the drill bit includes a drill bit body that has an axial forward end. The drill bit body has a hard insert, which is preferably monolithic, that is affixed to the drill bit body at the axial forward end thereof. The hard insert presents at least three discrete leading cutting edges for cutting the earth strata. Each cutting edge is stepped.
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