John (Youhe) ZHANG

Follow

Person

Tomball, TX, US

People

Patents Grantslast 30 patents

Information Patent Grant
Cutting element having stress reduced interface
- Patent number 8,322,467
- Issue date Dec 4, 2012
- Smith International, Inc.
- Yuelin Shen
- B22 - CASTING POWDER METALLURGY
Information Patent Grant
Stress relief feature on PDC cutter
- Patent number 7,740,090
- Issue date Jun 22, 2010
- Smith International, Inc.
- Yuelin Shen
- E21 - EARTH DRILLING MINING
Information Patent Grant
High-strength/high toughness alloy steel drill bit blank
- Patent number 7,395,884
- Issue date Jul 8, 2008
- Smith International, Inc.
- Kumar T. Kembaiyan
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Grant
High-strength/high-toughness alloy steel drill bit blank
- Patent number 7,044,243
- Issue date May 16, 2006
- Smith International, Inc.
- Kumar T. Kembaiyan
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Grant
Drill bit having adjustable total flow area
- Patent number 6,698,538
- Issue date Mar 2, 2004
- Smith International, Inc.
- Steffen S. Kristiansen
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
CUTTING ELEMENT HAVING STRESS REDUCED INTERFACE
- Publication number 20090090562
- Publication date Apr 9, 2009
- Smith International, Inc.
- Yuelin SHEN
- B22 - CASTING POWDER METALLURGY
Information Patent Application
Stress relief feature on PDC cutter
- Publication number 20060219439
- Publication date Oct 5, 2006
- Smith International, Inc.
- Yuelin Shen
- E21 - EARTH DRILLING MINING
Information Patent Application
High-strength/high toughness alloy steel drill bit blank
- Publication number 20060201718
- Publication date Sep 14, 2006
- Smith International, Inc.
- Kumar T. Kembaiyan
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Application
High-strength/high-toughness alloy steel drill bit blank
- Publication number 20040149494
- Publication date Aug 5, 2004
- SMITH INTERNATIONAL, INC.
- Kumar T. Kembaiyan
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Application
Drill bit having adjustable total flow area
- Publication number 20030010532
- Publication date Jan 16, 2003
- Steffen S. Kristiansen
- E21 - EARTH DRILLING MINING