Inventor
ZHANG JOHN YOUHE
US4 patents
⚠️ This page may combine multiple inventors who share the name “ZHANG JOHN YOUHE”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SMITH INTERNATIONAL
3 patentsUS7044243B2May 16, 2006
High-strength/high-toughness alloy steel drill bit blank
SMITH INTERNATIONAL94 citations96
US7740090B2Jun 22, 2010
Stress relief feature on PDC cutter
SMITH INTERNATIONAL28 citations91
US7395884B2Jul 8, 2008
High-strength/high toughness alloy steel drill bit blank
SMITH INTERNATIONAL11 citations82