LexDanaLexDanabeta
Inventor

Zheng Chen

Inventor
Katy, TX, US

Overview

5→
Patents
2004–2021
Patent span
Physics
Primary field (CPC G)

Patents· 5 as inventor

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

E21Bprimary
E21BEarth or rock drilling20%
G02BOptical elements, systems or apparatus20%
H04BTransmission20%
D21HPulp compositions10%
G01VGeophysics10%
G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein10%
H03FAmplifiers10%
PatentTitleYear
10,889,939Sizing method for making paper and paper prepared thereof202110,273,797Casing and cement evaluation tool with reduced transmitter ringing20199,869,173'Pulse generation for downhole logging'20186,912,343'Adjustable fiber optical filters'20056,744,948'Fiber tap monitor based on evanescent coupling'2004

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

2004–2005Patents assigned to OLUMA INC (2)· patent assignee history
2004Based in Carlsbad, CA, US· patent location history
2005Based in Chengdu, CN· patent location history
2018–2019Patents assigned to HALLIBURTON ENERGY SERVICES INC (2)· patent assignee history
2018–2019Based in Katy, TX, US· patent location history
2021Patents assigned to ECOLAB USA INC (1)· patent assignee history
2021Based in Shanghai, CN· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HALLIBURTON ENERGY SERVICES INC22018–2019
OLUMA INC22004–2005
ECOLAB USA INC12021
Locations
LocationPatentsSpan
Katy, Texas, US22018–2019
Shanghai, CN12021
Chengdu, CN12005
Carlsbad, California, US12004