Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
Patent Applications and Registrations
Patent applications and USPTO patent grants for Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann.The latest application filed is for "drying the surface of a fresh concrete body".
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann - Essen DE
| Patent | Date |
|---|---|
| Drying the surface of a fresh concrete body Grant 5,104,594 - Hillemeier , et al. April 14, 1 | 1992-04-14 |
| Track carrier for a high speed magnetic levitation transport system Grant 5,052,309 - Haselwander , et al. October 1, 1 | 1991-10-01 |
| Process for making a tunnel and advancing a tunneling read with a wall-supporting shield Grant 4,911,578 - Babendererde March 27, 1 | 1990-03-27 |
| Earth pressure shield Grant 4,844,656 - Babendererde , et al. July 4, 1 | 1989-07-04 |
| Method and apparatus for the spray placing of concrete layers Grant 4,804,563 - Hillemeier , et al. February 14, 1 | 1989-02-14 |
| Excavator for making a substantially vertical slot in the ground Grant 4,785,559 - Hentschel November 22, 1 | 1988-11-22 |
| Apparatus for excavating a substantially vertical slot Grant 4,744,425 - Hentschel May 17, 1 | 1988-05-17 |
| Process for providing a synthetic resin coating on a concrete structure Grant 4,670,315 - Hillemeier , et al. June 2, 1 | 1987-06-02 |
| Tunneling machine Grant 4,629,255 - Babendererde December 16, 1 | 1986-12-16 |
| Tunneling machine Grant 4,627,765 - Hentschel December 9, 1 | 1986-12-09 |
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