Inventor

DOUGLAS III CHARLES H S

US3 patents

⚠️ This page may combine multiple inventors who share the name “DOUGLAS III CHARLES H S”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

SMITH INTERNATIONAL

1 patent

US7703557B2Apr 27, 2010

Fixed cutter bit with backup cutter elements on primary blades

SMITH INTERNATIONAL61 citations96

SHEN YUELIN

1 patent

US8869919B2Oct 28, 2014

Drag bit with utility blades

SHEN YUELIN6 citations71

ULTERRA DRILLING TECH LP

1 patent

US12385325B2Aug 12, 2025

Drill bit with auxiliary channel openings

ULTERRA DRILLING TECH LP2 citations61