David William Dew

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Randburg, ZA

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Patents Grantslast 30 patents

Information Patent Grant
Recovery of precious metal from sulphide minerals by bioleaching
- Patent number 6,860,919
- Issue date Mar 1, 2005
- Billiton Intellectual Property, B.V.
- Alan Norton
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Grant
Recovery of copper from copper bearing sulphide minerals by bioleac...
- Patent number 6,833,020
- Issue date Dec 21, 2004
- Billiton Intellectual Property, B.V.
- David William Dew
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Grant
Recovery of nickel from nickel bearing sulphide minerals by bioleac...
- Patent number 6,733,567
- Issue date May 11, 2004
- Billiton Intellectual Property, B.V.
- David William Dew
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Grant
Recovery of nickel and copper from sulphide concentrates by bioleac...
- Patent number 6,582,494
- Issue date Jun 24, 2003
- Billiton Intellectual Property, B.V.
- David William Dew
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Grant
Copper, nickel and cobalt recovery
- Patent number 6,245,125
- Issue date Jun 12, 2001
- Billiton S.A. Limited
- David William Dew
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...

Patents Applicationslast 30 patents

Information Patent Application
Bioproduct production during oxidisation of metal sulphide minerals...
- Publication number 20040038354
- Publication date Feb 26, 2004
- David William Dew
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...