Inventor

CHANG CHUNG

US67 patents

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

CHANG CHUNG

HALLIBURTON ENERGY SERVICES INC

Acoustic logging tool utilizing fundamental resonance

Acoustic dipole piston transmitter

Short and wideband isolator for acoustic tools

Acoustic sensor self-induced interference control

Ultrasonic transducer with improved backing element

Acoustic logging tool utilizing fundamental resonance

Asymmetric bender bar transducer

Downhole acoustic source localization

Downhole ultrasound image correction in oil based mud

High precision acoustic logging processing for compressional and shear slowness

Quasi-static Stoneley slowness estimation

Downhole tool dynamic and motion measurement with multiple ultrasound transducer

Acoustic isolator for downhole tools

Structural element for sonic tools and acoustic isolators

Sonic through tubing cement evaluation

Downhole acoustic measurement

Bender bar transducer with at least three resonance modes

Through tubing cement evaluation based on casing extensional waves

Acoustic sensor self-induced interference control

Enhanced-resolution rock formation body wave slowness determination from borehole guided waves

Borehole imaging using amplitudes of refracted acoustic waves

Method of minimizing tool response for downhole logging operations

Downhole ultrasound image correction in oil based mud

Acoustic receiver assembly for downhole tools

Echo velocity measurements without using recessed ultrasonic transceiver

Sonic through tubing cement evaluation

Acoustic receivers with cylindrical crystals

Through tubing acoustic measurements

Hydrophone having no internal leads

Hydrophone having no internal leads

Acoustic transducer with piezoelectric elements having different polarities

Enhanced waveform analysis for target modes of borehole waves

Quadruple transmitter and methods to determine wave velocities of a downhole formation

Logging while drilling tool

SCHLUMBERGER TECHNOLOGY CORP

Acoustic logging tool sleeve

Acoustic source using a shaftless electrical hammer

Acoustic transducer with spiral-shaped piezoelectric shell

Downhole acoustic source

Two way check shot and reverse VSP while drilling

Geophysical prospecting method using pseudo-random pulse sequences

Downhole seismic source

Data logging

CHANG CHUNG

Apparatus and method for steam disinfection of liquid dispensing machine

Wide bandwidth borehole dipole source for acoustic logging

Acoustic imaging

MAXTOR CORP

Decoder for error correcting block codes

ADVANCED MICRO DEVICES INC

Overerase correction for flash memory which limits overerase and prevents erase verify errors

ORACLE INT CORP

Import/export and repartitioning of partitioned objects

ORACLE CORP

Import/export and repartitioning of partitioned objects

PROMERUS LLC

Vinyl addition polycyclic olefin polymers prepared with non-olefinic chain transfer agents and uses thereof