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For the Inventor, By the Inventor

Johannesburg, South Africa

Coxwold (proprietary) Limited


USPTO Granted Patents = 3

Forward Citations = 161

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2 inventors (with patents filed for the assignee):

goldMedal Dieter H Kallenbach (3 out of 15 patents)

silverMedal Andries J Stoltz (1 out of 2 patents)


3 patents:

1. 4807318 - Suction operated cleaner (1989-02-28),
2. 4742593 - Valve member for water interruption pool cleaner (1988-05-10),
3. 4642833 - Valve assembly (1987-02-17),
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USPTO Data Jan 1 1976 - Dec 16 2025

3 Patents

#30 in Johannesburg

#126 in South Africa

...
Johannesburg, South Africa

Coxwold (proprietary) Limited

Forward Citations = 161

2 inventors:

goldMedal Dieter H Kallenbach (3 out of 15 patents)

silverMedal Andries J Stoltz (1 out of 2 patents)

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