Alexander Yordanov Valchev

Person

Sofia, BG

People

Patents Grantslast 30 patents

Information Patent Grant
Direct-current arc furnace for steelmaking
- Patent number 4,783,790
- Issue date Nov 8, 1988
- Npp Po Elektrotermia
- Alexander Y. Valchev
- C21 - METALLURGY OF IRON
Information Patent Grant
Method of treating and refining liquid metal alloys by direct curre...
- Patent number 4,462,878
- Issue date Jul 31, 1984
- Iso "Metalurgkomplekt"
- Peter H. Savov
- C25 - ELECTROLYTIC OR ELECTROPHORETIC PROCESSES APPARATUS THEREFOR
Information Patent Grant
Apparatus for coating graphite electrodes
- Patent number 4,259,919
- Issue date Apr 7, 1981
- DSO "Cherna Metalurgia"
- Todor Y. Koychev
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
Information Patent Grant
Method and apparatus for the refining of iron-based melts
- Patent number 4,246,023
- Issue date Jan 20, 1981
- DSO "Charna Metalurgia"
- Peter H. Savov
- B22 - CASTING POWDER METALLURGY
Information Patent Grant
Apparatus for applying protective coatings to graphite bodies
- Patent number 4,226,207
- Issue date Oct 7, 1980
- DSO "Cherna Metalurgia"
- Ivan V. Genev
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Method for the refining of iron-based melts
- Patent number 4,200,452
- Issue date Apr 29, 1980
- DSO "Cherna Metalurgia"
- Peter H. Savov
- B22 - CASTING POWDER METALLURGY
Information Patent Grant
Method of steelmaking with direct current
- Patent number 4,110,547
- Issue date Aug 29, 1978
- DSO "Cherna Metalurgia"
- Vassil G. Peev
- C21 - METALLURGY OF IRON
Information Patent Grant
Contact clamp for graphite electrodes
- Patent number 4,101,186
- Issue date Jul 18, 1978
- DSO "Cherna Metalurgia"
- Georgi Metev Georgiev
- C25 - ELECTROLYTIC OR ELECTROPHORETIC PROCESSES APPARATUS THEREFOR
Information Patent Grant
Apparatus for the application of a protective coating to a graphite...
- Patent number 4,077,357
- Issue date Mar 7, 1978
- DSO "Cherna Metalurgia"
- Vassil Georgiev Peev
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...

Alexander Yordanov Valchev

Person

Patents Grantslast 30 patents

Direct-current arc furnace for steelmaking

Method of treating and refining liquid metal alloys by direct curre...

Apparatus for coating graphite electrodes

Method and apparatus for the refining of iron-based melts

Apparatus for applying protective coatings to graphite bodies

Method for the refining of iron-based melts

Method of steelmaking with direct current

Contact clamp for graphite electrodes

Apparatus for the application of a protective coating to a graphite...