For the Inventor, By the Inventor

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Heerenveen, Netherlands

A.p. Van Den Berg Holding B.v.

USPTO Granted Patents = 3

EPO Patents = 4

Forward Citations = 10

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8 inventors (with patents filed for the assignee):

Kok Seng Foo (1 out of 39 patents)

Arend Tjeerd Hoekstra (1 out of 1 patent)

Chin Kau Quah (1 out of 10 patents)

4. Okky Ahmad Purwana (1 out of 5 patents)

5. Lodewijk Keizer (1 out of 1 patent)

6. Mark Felton Randolph (1 out of 1 patent)

7. Mark Jason Cassidy (1 out of 2 patents)

8. Erik Peter Maria Landskroon (1 out of 1 patent)

3 patents: Sort by Forward Citations

1. 11619018 - Soil probing device having built-in generators and detectors for compressional waves and shear waves (2023-04-04),

2. 10316482 - Soil probing device having a string of flexibly connected rod sections (2019-06-11),

3. 8146418 - Apparatus and method for soil testing for jack-up rigs (2012-04-03),

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USPTO Data Jan 1 1976 - Dec 16 2025

3 Patents

#1 in Heerenveen

#1,640 in Netherlands

Heerenveen, Netherlands

A.p. Van Den Berg Holding B.v.

Forward Citations = 10

8 inventors:

Kok Seng Foo (1 out of 39 patents)

Arend Tjeerd Hoekstra (1 out of 1 patent)

Chin Kau Quah (1 out of 10 patents)

4. Okky Ahmad Purwana (1 out of 5 patents)

5. Lodewijk Keizer (1 out of 1 patent)

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