Patent Assignment
Reel/Frame 026972/0575
Release of Security Interest
Recorded: 2011-09-27
Received: 2011-09-27
Pages: 13
Assignor
DRILLBIT WCF LIMITED
Executed: 2011-09-26
Assignee
VAREL INTERNATIONAL IND., L.P.
1625 W. CROSBY ROAD, SUITE 124, CARROLLTON, TX, 75006, UNITED STATES
Covered Properties
(31)
Auto Adaptable Cutting Structure
Application:
12/794,640 →
Rock Bit Having a Seal Gland with a Conical Sealing Surface
Application:
12/757,959 →
Backfilled Polycrystalline Diamond Cutter with High Thermal Conductivity
Application:
12/716,208 →
Polycrystalline Diamond Cutter with High Thermal Conductivity
Application:
12/716,251 →
Drill Bit Supporting Multiple Cutting Elements with Multiple Cutter Geometries and Method of Assembly
Application:
12/708,003 →
Multi-Set Pdc Drill Bit and Method
Application:
12/636,506 →
High Energy Treatment of Cutter Substrates Having a Wear Resistant Layer
Application:
12/555,947 →
Force Balanced Asymmetric Drilling Reamer and Methods for Force Balancing
Application:
12/541,591 →
Self Positioning Cutter and Pocket
Application:
12/472,003 →
Texturing of the Seal Surface for a Roller Cone Rock Bit
Application:
12/399,171 →
Sectorial Force Balancing of Drill Bits
Application:
12/399,478 →
Method of Texturing a Bearing Surface of a Roller Cone Rock Bit
Application:
12/398,730 →
Method to Determine Rock Properties from Drilling Logs
Application:
12/359,065 →
Impregnated Rotary Bit
Application:
12/326,757 →
Process for the Production of a Thermally Stable Polycrystalline Diamond Compact
Application:
12/252,145 →
Rock Bit with a Thermal Insulating Seal Ring Positioned in the Seal Gland
Application:
12/252,252 →
Single Mold Milling Process
Application:
12/180,276 →
Auto Adaptable Cutting Structure
Application:
12/171,070 →
Rock Bit Having a Seal Gland with a Conical Sealing Surface
Application:
12/147,238 →
Process for the Production of an Element Comprising at Least One Block of Dense Material Constituted by Hard Particles Dispersed in a Binder Phase: Application to Cutting or Drilling Tools
Application:
12/056,595 →
PDC cutter for high compressive strength and highly abrasive formations
Application:
11/643,718 →
Drill Bit with Multiple Cutter Geometries
Application:
11/406,470 →
Bearing Seal
Application:
11/019,706 →
High-Energy Cascading of Abrasive Wear Components
Application:
10/657,896 →
Drill Out Bi-Center Bit and Method for Using Same
Application:
10/397,566 →
Low-Contact Area Cutting Element
Application:
10/355,674 →
Bearing Seal
Application:
10/294,056 →
Breakable Washer Earth Boring Bit
Application:
10/294,110 →
Spiral Wave Bladed Drag Bit
Application:
10/235,690 →
Drag-Type Casing Mill/Drill Bit
Application:
09/798,171 →
Superabrasive Cutting Element
Application:
09/777,295 →