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Frankfurt, Germany

Philipp Holzmann Aktiengesellschaft

USPTO Granted Patents = 17

Forward Citations = 133

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23 inventors (with patents filed for the assignee):

Wilfried Krabbe (5 out of 6 patents)

Hans Schafer (4 out of 4 patents)

Joachim Fischer (2 out of 3 patents)

4. Heinz Wind (2 out of 2 patents)

5. Wolfram Illgner (2 out of 2 patents)

6. Wolfgang Zerna (2 out of 2 patents)

7. Dietmar Kallinich (1 out of 3 patents)

8. Hansgeorg Balthaus (1 out of 1 patent)

9. Karl Hoffmann (1 out of 1 patent)

10. Andreas Monning (1 out of 1 patent)

11. Friedrich Lehmann (1 out of 1 patent)

12. Wolfgand Kahlert (1 out of 1 patent)

13. Ludwig Muhe (1 out of 1 patent)

14. Andreas Krieg (1 out of 1 patent)

15. Siegfried Brandl (1 out of 1 patent)

17 patents: Sort by Forward Citations

1. 5186217 - Fluid-impervious structure and method of making same (1993-02-16),

2. 5174394 - Apparatus for cleaning layers of earth (1992-12-29),

3. 5127771 - Narrow or slotted wall which is introduced into a substratum and sealing (1992-07-07),

4. 5061119 - Method and apparatus for the remediation of contaminated soils (1991-10-29),

5. 5018639 - Storage container for low-temperature liquids (1991-05-28),

6. 4662134 - Cryogenic wedge-type anchor for stranded tension cables (1987-05-05),

7. 4630798 - Method and device for erecting building structures such as bridges, (1986-12-23),

8. 4499699 - Molding device for sub-soil curtain wall sections (1985-02-19),

9. 4492087 - Container for storing refrigerated liquids (1985-01-08),

10. 4434591 - Component useful in producing a cooling tower (1984-03-06),

11. 4355453 - Method of protecting the surfaces of concrete structures (1982-10-26),

12. 4332508 - Shield for tunneling and mining (1982-06-01),

13. 4298230 - Tunnelling apparatus (1981-11-03),

14. 4255366 - Process of producing a cooling tower (1981-03-10),

15. 4253781 - Method and an apparatus for providing a grouted anchorage against (1981-03-03),

Philipp Holzmann Aktiengesellschaft was a German construction company based in Frankfurt. Founded in 1849, it was once one of the largest construction companies in Europe. The company specialized in building large-scale infrastructure projects such as airports, highways, and bridges. Holzmann was also known for its expertise in engineering and project management. The company faced financial difficulties in the late 1990s and eventually went bankrupt in 2002.

Profile summary based on public USPTO records.

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USPTO Data Jan 1 1976 - Sep 29 2026

17 Patents

#49 in Frankfurt

#2,492 in Germany

#35,857 in the World

Frankfurt, Germany

Philipp Holzmann Aktiengesellschaft

Forward Citations = 133

23 inventors:

Wilfried Krabbe (5 out of 6 patents)

Hans Schafer (4 out of 4 patents)

Joachim Fischer (2 out of 3 patents)

4. Heinz Wind (2 out of 2 patents)

5. Wolfram Illgner (2 out of 2 patents)

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