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For the Inventor, By the Inventor

Sofia, Bulgaria

Dso 'Cherna Metalurgia'

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USPTO Granted Patents = 8

Forward Citations = 34

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18 inventors (with patents filed for the assignee):

goldMedal Alexander Y Valchev (6 out of 9 patents)

silverMedal Ivan V Genev (4 out of 8 patents)

bronzeMedal Vassil G Peev (4 out of 7 patents)

4.  Todor Yankov Koychev (3 out of 3 patents)

5.  Lyuben Kostov Lazov (2 out of 2 patents)

6.  Georgi M Georgiev (2 out of 3 patents)

7.  Nikola A Lingorski (1 out of 3 patents)

8.  Peter H Savov (1 out of 5 patents)

9.  Assen Yordanov Georgiev (1 out of 1 patent)

10.  Nikolay G Bakalov (1 out of 3 patents)

11.  Peter Lazarov Shivachev (1 out of 1 patent)

12.  Hristo Nenchev Parashkevov (1 out of 1 patent)

13.  Emil Pantaleev Ninov (1 out of 1 patent)

14.  Avedis Mardik Dersarkisyan (1 out of 1 patent)

15.  Yordan Ivanov Krestenyakov (1 out of 2 patents)


8 patents:

1. 4259919 - Apparatus for coating graphite electrodes (1981-04-07),
2. 4226207 - Apparatus for applying protective coatings to graphite bodies (1980-10-07),
3. 4200452 - Method for the refining of iron-based melts (1980-04-29),
4. 4199113 - Disc-type apparatus for crushing hard materials (1980-04-22),
5. 4110547 - Method of steelmaking with direct current (1978-08-29),
6. 4101186 - Contact clamp for graphite electrodes (1978-07-18),
7. 4077357 - Apparatus for the application of a protective coating to a graphite (1978-03-07),
8. 4013401 - Apparatus for preheating a raw material charge for application to an (1977-03-22),
Company Overview
Dso 'cherna Metalurgia' is a leading metallurgical company specializing in the production of high-quality metal products. With state-of-the-art facilities and a team of skilled professionals, we offer a wide range of metalworking services to meet the needs of our clients. Our commitment to quality and customer satisfaction sets us apart in the industry, making us a trusted partner for all metal fabrication needs.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Nov 3 2026

8 Patents

#6 in Sofia

#8 in Bulgaria

Sofia, BG
Sofia, Bulgaria

Dso 'Cherna Metalurgia'

Forward Citations = 34

18 inventors:

goldMedal Alexander Y Valchev (6 out of 9 patents)

silverMedal Ivan V Genev (4 out of 8 patents)

bronzeMedal Vassil G Peev (4 out of 7 patents)

4.  Todor Yankov Koychev (3 out of 3 patents)

5.  Lyuben Kostov Lazov (2 out of 2 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Dso 'Cherna Metalurgia'. Retrieved from https://idiyas.com/company/dso-cherna-metalurgia

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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