Inventor
DERWIN DAVID J
US8 patents
⚠️ This page may combine multiple inventors who share the name “DERWIN DAVID J”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SUPERIOR GRAPHITE CO
6 patentsUS5826669AOct 27, 1998
Drilling fluid loss prevention and lubrication additive
SUPERIOR GRAPHITE CO158 citations96
US6287694B1Sep 11, 2001
Method for expanding lamellar forms of graphite and resultant product
SUPERIOR GRAPHITE CO90 citations94
US8617309B1Dec 31, 2013
Cement compositions including resilient graphitic carbon fraction
SUPERIOR GRAPHITE CO14 citations75
US6971819B2Dec 6, 2005
Electrically conductive pavement mixture
SUPERIOR GRAPHITE CO6 citations70
US8999898B2Apr 7, 2015
Drilling fluid additive for loss circulation and wellbore strengthening
SUPERIOR GRAPHITE CO2 citations59
US6660434B2Dec 9, 2003
Engineered carbonaceous materials and power sources using these materials
SUPERIOR GRAPHITE CO2 citations56