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Forward Citations = 55

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11 inventors (with patents filed for the assignee):

Norbert L Piret (3 out of 4 patents)

Herbert Kudelka (3 out of 4 patents)

Karl Lippert (2 out of 2 patents)

4. Wilhelm Roever (2 out of 2 patents)

5. Ulrich Scheffler (1 out of 3 patents)

6. Hans Joachim Rabben (1 out of 1 patent)

7. Siegbert Schmidt (1 out of 1 patent)

8. Helmut Junghanss (1 out of 1 patent)

9. Meinolf Hopper (1 out of 2 patents)

10. Heinz Planken (1 out of 1 patent)

11. Dieter Neuschutz (1 out of 6 patents)

6 patents: Sort by Forward Citations

1. 4131454 - Process for recovering silver and gold from chloride solutions (1978-12-26),

2. 4127639 - Process for recovering silver from residues containing silver and lead (1978-11-28),

3. 4104055 - Process for working up copper cementate sludges (1978-08-01),

4. 4030990 - Process for recovering electrolytic copper of high purity by means of (1977-06-21),

5. 4008076 - Method for processing manganese nodules and recovering the values (1977-02-15),

6. 3969107 - Combined process for working up pure and complex copper concentrates (1976-07-13),

Duisburger Kupferhütte is a leading German copper smelting company headquartered in Duisburg. With over 100 years of experience in the industry, the company specializes in the production of high-quality copper products for a variety of applications, including automotive, electronics, and construction. Duisburger Kupferhütte is committed to sustainable and environmentally friendly production practices, ensuring the highest standards of quality and efficiency in all its operations.

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USPTO Data Jan 1 1976 - Dec 9 2025

6 Patents

#27 in Duisburg

#5,316 in Germany

Duisburg, Germany

Duisburger Kupferhutte