Forward Citations = 56

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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 - Oct 20 2026

7 Patents

#23 in Ludwigshafen

#4,865 in Germany

Ludwigshafen, Germany

Grunzweig + Hartmann Ag

Forward Citations = 56

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)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Grunzweig + Hartmann Ag. Retrieved from https://idiyas.com/company/grunzweig-plus-hartmann-ag

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]