Inventor

Chung Chang

Inventor

Houston, TX, US

Overview

24→

Patents

1990–2020

Patent span

Physics

Primary field (CPC G)

Patents· 24 as inventor

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

G01Vprimary

G01VGeophysics35%

E21BEarth or rock drilling22%

B06BMethods or apparatus for generating or transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency, e.g. for performing mechanical work in general7%

G01NInvestigating or analysing materials by determining their chemical or physical properties6%

G01HMeasurement of mechanical vibrations or ultrasonic, sonic or infrasonic waves4%

G10KSound-producing devices4%

H01LSemiconductor devices4%

H04RLoudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers4%

A61BDiagnosis2%

B60BVehicle wheels2%

PatentTitleYear

10,775,525Identifying and visually presenting formation slowness based on low-frequency dispersion asymptotes2020 10,670,761Quasi-static Stoneley slowness estimation2020 10,663,612Real-time determination of mud slowness, formation type, and monopole slowness picks in downhole applications2020 10,663,435Acoustic receivers with cylindrical crystals2020 10,598,563Downhole acoustic source localization2020 10,488,538Apparatus and techniques for acoustic logging tool modeling2019 10,481,288Ultrasonic transducer with improved backing element2019 10,473,808Acoustic logging tool utilizing fundamental resonance2019 10,393,903Acoustic logging tool utilizing fundamental resonance2019 10,330,810Hydrophone having no internal leads2019 10,317,555Method of minimizing tool response for downhole logging operations2019 10,293,376Bender bar transducer with at least three resonance modes2019 10,082,020Acoustic dipole piston transmitter2018 10,024,992Structural element for sonic tools and acoustic isolators2018 9,952,344High-performance dipole acoustic transmitter2018 9,926,781'Wide bandwidth drill pipe structure for acoustic telemetry'2018 9,891,336'Acoustic isolator for downhole tools'2018 9,869,141'Downhole tool vibration device and method'2018 9,757,770'Asymmetric bender bar transducer'2017 9,631,476'Variable stiffness downhole tool housing'2017 9,322,947'Acoustic receiver assembly for downhole tools'2016 9,110,166'Acoustic imaging'2015 7,213,818'Stroller having wheel rotation control device'2007 4,933,619'Stepping motor servo control system for a floppy disk drive'1990

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1990Based in Maetan-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do, KR· patent location history

2007Patents assigned to ABMEX ENTPR CO LTD (1)· patent assignee history

2007Based in Taipei, TW· patent location history

2015–2020Patents assigned to HALLIBURTON ENERGY SERVICES INC (22)· patent assignee history

2015–2018Patents assigned to CHANG CHUNG (3)· patent assignee history

2015–2017Patents assigned to CHENG ARTHUR (2)· patent assignee history

2015–2020Based in Houston, TX, US· patent location history

2017Patents assigned to KAINER GARY (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HALLIBURTON ENERGY SERVICES INC	22	2015–2020
CHANG CHUNGself	3	2015–2018
CHENG ARTHUR	2	2015–2017
ABMEX ENTPR CO LTD	1	2007
KAINER GARY	1	2017

Locations

Location	Patents	Span
Houston, Texas, US	22	2015–2020
Taipei, TW	1	2007
Maetan-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do, KR	1	1990