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Inventor

Walter S. Dillard

Inventor
Houston, TX, US

Overview

10→
Patents
2000–2021
Patent span
Fixed constructions
Primary field (CPC E)

Patents· 10 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

E21Bprimary
E21BEarth or rock drilling71%
G01FMeasuring volume, volume flow, mass flow or liquid level21%
Y10TTechnical subjects covered by former us classification7%
PatentTitleYear
11,131,156Managed pressure control system with variable built-in accuracy202110,598,527Differential flow measurement with Coriolis flowmeter202010,227,838Drilling system and method having flow measurement choke201910,174,571Control of multiple hydraulic chokes in managed pressure drilling201910,107,052Control of hydraulic power flowrate for managed pressure drilling201810,094,185Coriolis flow meter having flow tube with equalized pressure differential201810,094,186Controlled pressure drilling system with flow measurement and well control201810,012,044Annular isolation device for managed pressure drilling20186,138,778'Rock bit lubricant relief valve'20006,095,264'Rolling cutter drill bit with stabilized insert holes and method for making a rolling cutter drill bit with stabilized insert holes'2000

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

2000Patents assigned to CAMCO INT (2)· patent assignee history
2000Based in Pasadena, TX, US· patent location history
2018–2021Patents assigned to WEATHERFORD TECH HOLDINGS LLC (8)· patent assignee history
2018Patents assigned to WEATHERFORD TECH HOLDING LLC (1)· patent assignee history
2018–2021Based in Houston, TX, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
WEATHERFORD TECH HOLDINGS LLC82018–2021
CAMCO INT22000
WEATHERFORD TECH HOLDING LLC12018
Locations
LocationPatentsSpan
Houston, Texas, US82018–2021
Pasadena, Texas, US22000