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Norman L. Kotraba
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Tega Cay, SC, US
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last 30 patents
Information
Patent Grant
Direct reduction process in a rotary hearth furnace
Patent number
5,186,741
Issue date
Feb 16, 1993
Zia Patent Company
Norman L. Kotraba
C21 - METALLURGY OF IRON
Information
Patent Grant
Heat treating furnace
Patent number
5,164,147
Issue date
Nov 17, 1992
Zia Patent Company
N. Edward Bottinelli
F27 - FURNACES KILNS OVENS RETORTS
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Patent Grant
Method and apparatus for direct reduction of metal oxides
Patent number
4,983,214
Issue date
Jan 8, 1991
ZIA Technology, Inc.
N. Edward Bottinelli
F27 - FURNACES KILNS OVENS RETORTS
Information
Patent Grant
Continuous feed shaft retort process for recovery of non-ferrous me...
Patent number
4,963,182
Issue date
Oct 16, 1990
ZIA Technology, Inc.
Norman G. Bishop
C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information
Patent Grant
Pneumatic steelmaking vessel and method of producing steel
Patent number
4,931,090
Issue date
Jun 5, 1990
ZIA Technology, Inc.
N. Edward Bottinelli
C21 - METALLURGY OF IRON
Information
Patent Grant
Method for reclaiming metal values from electric arc furnace flue d...
Patent number
4,836,847
Issue date
Jun 6, 1989
ZIA Technology, Inc.
Norman G. Bishop
C21 - METALLURGY OF IRON
Information
Patent Grant
Method and apparatus for reclaiming metal values from electric arc...
Patent number
4,758,268
Issue date
Jul 19, 1988
ZIA Technology, Inc.
Norman G. Bishop
C21 - METALLURGY OF IRON