LexDanaLexDanabeta
Inventor

ZEMIN JI

Inventor
CN

Overview

3→
Patents
2021–2022
Patent span
Performing operations
Primary field (CPC B)

Patents· 3 as inventor

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

E21Bprimary
E21BEarth or rock drilling38%
B01FMixing, e.g. dissolving, emulsifying or dispersing25%
B01DSeparation13%
B01JChemical or physical processes, e.g. catalysis or colloid chemistry13%
B06BMethods or apparatus for generating or transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency, e.g. for performing mechanical work in general13%
PatentTitleYear
11,428,065Borehole wall resistance increasing apparatus for improving energy utilization rate of injection gas202211,344,824Ultrasonic microbubble generation method, apparatus and system202211,179,683Microbubble generation device and equipment2021

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

2021–2022Patents assigned to PETROCHINA CO LTD (3)· patent assignee history
2021–2022Based in CN· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
PETROCHINA CO LTD32021–2022
Locations
LocationPatentsSpan
CN32021–2022