Inventor
Douglas J. Lehr
Inventor
The Woodlands, TX, US
Overview
Patents· 29 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
E21Bprimary
E21BEarth or rock drilling81%
G01LMeasuring force, stress, torque, work, mechanical power, mechanical efficiency, or fluid pressure6%
Y10TTechnical subjects covered by former us classification6%
F16BDevices for fastening or securing constructional elements or machine parts together, e.g. nails, bolts, circlips, clamps, clips or wedges3%
F16KValves3%
Y02CCapture, storage, sequestration or disposal of greenhouse gases [ghg]3%
PatentTitleYear
10,550,666Slow response time tool202010,119,350Expandable junk mill201810,100,634Devices and methods to communicate information from below a surface cement plug in a plugged or abandoned well20189,915,126'High pressure circulating shoe track with redundant pressure isolation feature'20189,650,853'Downhole cutting and jacking system'20179,422,966'Shear member post shear segment retention apparatus'20169,284,803'One-way flowable anchoring system and method of treating and producing a well'20169,284,814'Downhole tool with remotely actuated drag blocks and methods'20169,273,526'Downhole anchoring systems and methods of using same'20169,080,416'Setting tool, anchoring and sealing device and system'20158,910,722'Slip-deployed anti-extrusion backup ring'20148,839,874'Packing element backup system'20148,714,271'Multi-purpose fill and circulate well tool'20147,854,268'Deep water hurricane valve'20107,600,572'Drillable bridge plug'20097,475,736'Self centralizing non-rotational slip and cone system for downhole tools'20097,255,178'Drillable bridge plug'20077,163,066'Gravity valve for a downhole tool'20076,708,770'Drillable bridge plug'20046,708,768'Drillable bridge plug'20046,578,633'Drillable bridge plug'20036,491,108'Drillable bridge plug'20026,414,905'Method and apparatus for communicating coded messages in a wellbore'20026,315,041'Multi-zone isolation tool and method of stimulating and testing a subterranean well'20016,006,838'Apparatus and method for stimulating multiple production zones in a wellbore'19995,931,229'Through tubing gravel pack system and method of gravel packing'19995,579,283'Method and apparatus for communicating coded messages in a wellbore'19964,953,622'Subterranean well casing float tool'19904,872,510'Subterranean well casing float tool'1989Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1989–2018Patents assigned to BAKER HUGHES INC (15)· patent assignee history
1989–1990Based in Houston, TX, US· patent location history
1996–2020Based in The Woodlands, TX, US· patent location history
1999–2009Patents assigned to BJ SERVICES CO (10)· patent assignee history
2014–2020Patents assigned to LEHR DOUGLAS J (5)· patent assignee history
2014Patents assigned to BISHOP DAVID S (2)· patent assignee history
2014–2016Based in Spring, TX, US· patent location history
2018–2020Patents assigned to BAKER HUGHES A GE CO LLC (4)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| BAKER HUGHES INC | 15 | 1989–2018 |
| BJ SERVICES CO | 10 | 1999–2009 |
| LEHR DOUGLAS Jself | 5 | 2014–2020 |
| BAKER HUGHES A GE CO LLC | 4 | 2018–2020 |
| BISHOP DAVID S | 2 | 2014 |
Locations
| Location | Patents | Span |
|---|---|---|
| The Woodlands, Texas, US | 25 | 1996–2020 |
| Spring, Texas, US | 2 | 2014–2016 |
| Houston, Texas, US | 2 | 1989–1990 |