LexDanaLexDanabeta
Inventor

Renjie Ji

Inventor
Qingdao, CN

Overview

3→
Patents
2018–2021
Patent span
Fixed constructions
Primary field (CPC E)

Patents· 3 as inventor

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

E21Bprimary
E21BEarth or rock drilling75%
F16KValves25%
PatentTitleYear
11,085,245Multi-path combined high-low voltage plasma rock-breaking drill bit, drill bit apparatus and drilling method202110,989,019Fully-electrically driven downhole safety valve20219,970,270Movable combined sand control pipe of axial and radial slotted screen pipes2018

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

2018–2021Patents assigned to UNIV CHINA PETROLEUM EAST CHINA (3)· patent assignee history
2018–2021Based in Qingdao, CN· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
UNIV CHINA PETROLEUM EAST CHINA32018–2021
Locations
LocationPatentsSpan
Qingdao, CN32018–2021