LandOfFree - US Patents - Listing for Boring or penetrating the earth,With means movable relative to tool or shaft to control...,Valve prevents upward flow

Boring or penetrating the earth – With means movable relative to tool or shaft to control... – Valve prevents upward flow

Combination fluid nozzle and backflow valve

Boring or penetrating the earth – With means movable relative to tool or shaft to control... – Valve prevents upward flow

Drill bit having springless check valve and method of blocking b

Boring or penetrating the earth – With means movable relative to tool or shaft to control... – Valve prevents upward flow

Flow control valve for rock bits

Boring or penetrating the earth – With means movable relative to tool or shaft to control... – Valve prevents upward flow

Method and apparatus for cementing drill strings in place for on

Boring or penetrating the earth – With means movable relative to tool or shaft to control... – Valve prevents upward flow

Method and apparatus for cementing drill strings in place...

Boring or penetrating the earth – With means movable relative to tool or shaft to control... – Valve prevents upward flow

Methods and apparatus for cementing drill strings in place...

Boring or penetrating the earth – With means movable relative to tool or shaft to control... – Valve prevents upward flow

Methods and apparatus for cementing drill strings in place...

Boring or penetrating the earth – With means movable relative to tool or shaft to control... – Valve prevents upward flow

One pass drilling and completion of extended reach lateral...

Boring or penetrating the earth – With means movable relative to tool or shaft to control... – Valve prevents upward flow

One pass drilling and completion of wellbores with drill bit att

Boring or penetrating the earth – With means movable relative to tool or shaft to control... – Valve prevents upward flow

One-way drill string clutch

Boring or penetrating the earth – With means movable relative to tool or shaft to control... – Valve prevents upward flow

Reverse circulation bit apparatus

Boring or penetrating the earth – With means movable relative to tool or shaft to control... – Valve prevents upward flow

Reverse circulation directional and horizontal drilling...

Boring or penetrating the earth – With means movable relative to tool or shaft to control... – Valve prevents upward flow

Water separator and backflow valve