Herman Pieterse

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Tuscon, AZ, US

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Patents Grantslast 30 patents

Information Patent Grant
Acid resistant cement composition
- Patent number 5,989,330
- Issue date Nov 23, 1999
- Barrick Gold Corporation
- Charles Semler
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Gold recovery using controlled oxygen distribution pressure oxidation
- Patent number 5,489,326
- Issue date Feb 6, 1996
- Barrick Gold Corporation
- Kenneth G. Thomas
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Grant
Process for recovery of gold from refractory ores
- Patent number 5,071,477
- Issue date Dec 10, 1991
- American Barrick Resources Corporation of Toronto
- Kenneth G. Thomas
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...