Inventor

LEHR DOUGLAS J

US27 patents

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

LEHR DOUGLAS J

BJ SERVICES CO

Gravity valve for a downhole tool

Drillable bridge plug

Drillable bridge plug

Drillable bridge plug

Self centralizing non-rotational slip and cone system for downhole tools

Drillable bridge plug

Drillable bridge plug

Drillable bridge plug

Apparatus and method for stimulating multiple production zones in a wellbore

Through tubing gravel pack system and method of gravel packing

BAKER HUGHES INC

Method and apparatus for communicating coded messages in a wellbore

Downhole cutting and jacking system

Downhole anchoring systems and methods of using same

Devices and methods to communicate information from below a surface cement plug in a plugged or abandoned well

Subterranean well casing float tool

Subterranean well casing float tool

Shear member post shear segment retention apparatus

High pressure circulating shoe track with redundant pressure isolation feature

BISHOP DAVID S

Slip-deployed anti-extrusion backup ring

Packing element backup system

(unassigned)

Multi-zone isolation tool and method of stimulating and testing a subterranean well

STONE PATRICK C

One-way flowable anchoring system and method of treating and producing a well

XU YINGQING

Setting tool, anchoring and sealing device and system

BJ SERVICES COMPANY LLC

Deep water hurricane valve

BAKER HUGHES A GE CO LLC

Expandable junk mill

KOTTMYER DANIEL L

Retention structure for heat generating component

FISHER BRITAIN A

Slow response time tool