Douglas Sewerin Ekman

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Helsingborg, SW

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Patents Grantslast 30 patents

Information Patent Grant
Method of producing a partially reduced product from finely-divided...
- Patent number 4,087,274
- Issue date May 2, 1978
- Boliden Aktiebolag
- Ingvar A. O. Edenwall
- C21 - METALLURGY OF IRON
Information Patent Grant
Method of carrying out heat-requiring chemical and/or physical proc...
- Patent number 3,948,645
- Issue date Apr 6, 1976
- Boliden Aktiebolag
- Hans Ivar Elvander
- C21 - METALLURGY OF IRON
Information Patent Grant
Method of carrying out heat-requiring chemical and/or physical proc...
- Patent number 3,948,640
- Issue date Apr 6, 1976
- Boliden Aktiebolag
- Hans Ivar Elvander
- C21 - METALLURGY OF IRON