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Inventor

Benjamin Tai An Chang

Inventor
Houston, TX, US

Overview

2→
Patents
2000–2005
Patent span
Performing operations
Primary field (CPC B)

Patents· 2 as inventor

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

B01Dprimary
B01DSeparation25%
C09DCoating compositions, e.g. paints, varnishes or lacquers25%
E21BEarth or rock drilling25%
Y10TTechnical subjects covered by former us classification25%
PatentTitleYear
6,896,063'Methods of using downhole polymer plug'20056,103,645'Foam filter material and process to prepare foam filter material'2000

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

2000–2005Patents assigned to SHELL OIL CO (2)· patent assignee history
2000–2005Based in Houston, TX, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
SHELL OIL CO22000–2005
Locations
LocationPatentsSpan
Houston, Texas, US22000–2005