Norvald Gjelsvik

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Oslo, NO

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Patents Grantslast 30 patents

Information Patent Grant
Method of acid leaching of silicates
- Patent number 4,367,215
- Issue date Jan 4, 1983
- Elkem a/s
- Norvald Gjelsvik
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Grant
Mixer-settler apparatus
- Patent number 4,352,574
- Issue date Oct 5, 1982
- Forskningsgruppe for Sjeldne Jordarter
- Norvald Gjelsvik
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Method of precipitation of pure aluminiumchloride from solutions wh...
- Patent number 4,297,327
- Issue date Oct 27, 1981
- Elkem-Spigerverket a/s
- Norvald Gjelsvik
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Method of producing a pure aluminiumoxide from solutions containing...
- Patent number 4,297,326
- Issue date Oct 27, 1981
- Elkem-Spigerverket a/s
- Norvald Gjelsvik
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Method of producing yttrium oxide with particularly big particles
- Patent number 4,238,467
- Issue date Dec 9, 1980
- Martin Dugan
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the extraction of alumina from aluminum-containing sili...
- Patent number 4,110,399
- Issue date Aug 29, 1978
- Institutt for Atomenergi
- Bjorn Gaudernack
- C01 - INORGANIC CHEMISTRY