LexDanaLexDanabeta
Inventor

Guanhua NI

Inventor
CN

Overview

2→
Patents
2022
Patent span
Fixed constructions
Primary field (CPC E)

Patents· 2 as inventor

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

E21Bprimary
E21BEarth or rock drilling29%
E21FSafety devices, transport, filling-up, rescue, ventilation, or draining in or of mines or tunnels29%
C04BLime, magnesia14%
C09KMaterials for miscellaneous applications, not provided for elsewhere14%
E21CMining or quarrying14%
PatentTitleYear
11,506,041Drilling-slitting-sealing-fracturing device and method for a deep low-permeability gassy coal seam202211,396,810Full-length screen pipe hole protection device and method with pressurized hole packing in soft coal seam2022

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

2022Patents assigned to UNIV SHANDONG SCIENCE & TECH (2)· patent assignee history
2022Based in CN· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
UNIV SHANDONG SCIENCE & TECH22022
Locations
LocationPatentsSpan
CN22022