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For the Inventor, By the Inventor

Fochville, South Africa

Master Sinkers (pty) Ltd


USPTO Granted Patents = 2

Forward Citations = 0

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5 inventors (with patents filed for the assignee):

goldMedal Nicolaas Bodenstein Goodwin (2 out of 3 patents)

silverMedal Barend Jacobus Jordaan (2 out of 4 patents)

bronzeMedal Daniel Coenraad Pretorius (1 out of 2 patents)

4.  Louis Germishuys (1 out of 2 patents)

5.  Gerhard Pretorius (1 out of 1 patent)


2 patents:

1. 12031438 - Cutter head arrangement (2024-07-09),
2. 10947845 - Shaft enlargement arrangement for a boring system (2021-03-16),
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USPTO Data Jan 1 1976 - Dec 16 2025

2 Patents

#1 in Fochville

#198 in South Africa

...
Fochville, South Africa

Master Sinkers (pty) Ltd

Forward Citations = 0

5 inventors:

goldMedal Nicolaas Bodenstein Goodwin (2 out of 3 patents)

silverMedal Barend Jacobus Jordaan (2 out of 4 patents)

bronzeMedal Daniel Coenraad Pretorius (1 out of 2 patents)

4.  Louis Germishuys (1 out of 2 patents)

5.  Gerhard Pretorius (1 out of 1 patent)

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