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Ludwigshafen, Germany

Grunzweig + Hartmann Ag

USPTO Granted Patents = 7

Forward Citations = 54

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12 inventors (with patents filed for the assignee):

Joachim Mellem (3 out of 7 patents)

Klemens Hirschmann (3 out of 3 patents)

Lothar Bihy (1 out of 6 patents)

4. Johannes Horres (1 out of 4 patents)

5. Heinz-Jurgen Ungerer (1 out of 4 patents)

6. Wilfried Naber (1 out of 1 patent)

7. Klaus Sistermann (1 out of 3 patents)

8. Hans Kummermehr (1 out of 9 patents)

9. Reinhard Stoyke (1 out of 3 patents)

10. Gustav Schweinfurth (1 out of 2 patents)

11. Heinz-Juergen Ungerer (1 out of 1 patent)

12. Hans Furtak (1 out of 1 patent)

7 patents: Sort by Forward Citations

1. 5368623 - Process and apparatus for the continuous production of mineral wool (1994-11-29),

2. 5296013 - Process and apparatus for the continuous production of mineral wool (1994-03-22),

3. 5246653 - Apparatus for the continuous production of mineral wool nonwovens (1993-09-21),

4. 5093069 - Process and device for the production of mineral wool nonwoven fabrics (1992-03-03),

5. 5057173 - Process for the production of needle felt from rock wool (1991-10-15),

6. 5036585 - Process for the manufacture of an exhaust silencer (1991-08-06),

7. 4940478 - Method of melting raw materials (1990-07-10),

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USPTO Data Jan 1 1976 - Dec 30 2025

7 Patents

#25 in Ludwigshafen

#4,802 in Germany

Ludwigshafen, Germany

Grunzweig + Hartmann Ag

Forward Citations = 54

12 inventors:

Joachim Mellem (3 out of 7 patents)

Klemens Hirschmann (3 out of 3 patents)

Lothar Bihy (1 out of 6 patents)

4. Johannes Horres (1 out of 4 patents)

5. Heinz-Jurgen Ungerer (1 out of 4 patents)

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