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Hochtief Aktiengesellschaft Vorm. Gebr.helfmann

USPTO Granted Patents = 27

Forward Citations = 197

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22 inventors (with patents filed for the assignee):

Siegmund Hflm Babendererde (11 out of 18 patents)

Volker Hentschel (9 out of 11 patents)

Otto Braach (7 out of 7 patents)

4. Bernd Hillemeier (6 out of 7 patents)

5. Wolf Magnus (3 out of 3 patents)

6. Gunnar Lah (2 out of 3 patents)

7. Clemens Versteegen (2 out of 2 patents)

8. Richard Pohl (2 out of 2 patents)

9. Gunter Brockmann (2 out of 2 patents)

10. Guido Krumbach (1 out of 1 patent)

11. Henning Riech (1 out of 1 patent)

12. Werner Jonas (1 out of 1 patent)

13. Bernhard Haselwander (1 out of 1 patent)

14. Claus Flohrer (1 out of 1 patent)

15. Andreas Schaab (1 out of 1 patent)

27 patents: Sort by Forward Citations

1. 5104594 - Drying the surface of a fresh concrete body (1992-04-14),

2. 5052309 - Track carrier for a high speed magnetic levitation transport system (1991-10-01),

3. 4977715 - Reinforced-concrete building element (1990-12-18),

4. 4911578 - Process for making a tunnel and advancing a tunneling read with a (1990-03-27),

5. 4909668 - Movable sealing assembly for tunneling machines (1990-03-20),

6. 4856936 - Form for concrete-placement tunnel lining (1989-08-15),

7. 4854776 - Process and apparatus for lining a tunnel with concrete (1989-08-08),

8. 4848963 - Earth pressure shield (1989-07-18),

9. 4844656 - Earth pressure shield (1989-07-04),

10. 4824022 - Method of and apparatus for applying a sprayed concrete layer to a (1989-04-25),

11. 4820458 - Process for continuously lining a tunnel with extruded concrete (1989-04-11),

12. 4804563 - Method and apparatus for the spray placing of concrete layers (1989-02-14),

13. 4789267 - Method of and apparatus for concrete tunnel lining (1988-12-06),

14. 4785559 - Excavator for making a substantially vertical slot in the ground (1988-11-22),

15. 4768898 - Process and apparatus for continuously lining a tunnel with extruded (1988-09-06),

Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann is a German construction company that provides services worldwide. With a history dating back to 1875, Hochtief has grown into one of the largest construction companies globally. The company specializes in infrastructure development, real estate construction, and project management. Hochtief is known for its innovative engineering solutions and commitment to sustainability. Visit their website to learn more about their projects and services.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Dec 9 2025

27 Patents

#24 in Essen

#1,760 in Germany

#23,254 in the World

Hochtief Aktiengesellschaft Vorm. Gebr.helfmann

Forward Citations = 197

22 inventors:

Siegmund Hflm Babendererde (11 out of 18 patents)

Volker Hentschel (9 out of 11 patents)

Otto Braach (7 out of 7 patents)

4. Bernd Hillemeier (6 out of 7 patents)

5. Wolf Magnus (3 out of 3 patents)

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