Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann

Organization

Essen, DE

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Patents Grantslast 30 patents

Information Patent Grant
Drying the surface of a fresh concrete body
- Patent number 5,104,594
- Issue date Apr 14, 1992
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Bernd Hillemeier
- E04 - BUILDING
Information Patent Grant
Track carrier for a high speed magnetic levitation transport system
- Patent number 5,052,309
- Issue date Oct 1, 1991
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Bernhard Haselwander
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information Patent Grant
Reinforced-concrete building element
- Patent number 4,977,715
- Issue date Dec 18, 1990
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Guido Krumbach
- E04 - BUILDING
Information Patent Grant
Process for making a tunnel and advancing a tunneling read with a w...
- Patent number 4,911,578
- Issue date Mar 27, 1990
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Siegmund Babendererde
- E21 - EARTH DRILLING MINING
Information Patent Grant
Movable sealing assembly for tunneling machines
- Patent number 4,909,668
- Issue date Mar 20, 1990
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Siegmund Babendererde
- E21 - EARTH DRILLING MINING
Information Patent Grant
Form for concrete-placement tunnel lining
- Patent number 4,856,936
- Issue date Aug 15, 1989
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Volker Hentschel
- E21 - EARTH DRILLING MINING
Information Patent Grant
Process and apparatus for lining a tunnel with concrete
- Patent number 4,854,776
- Issue date Aug 8, 1989
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Volker Hentschel
- E21 - EARTH DRILLING MINING
Information Patent Grant
Earth pressure shield
- Patent number 4,848,963
- Issue date Jul 18, 1989
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Siegmund Babendererde
- E21 - EARTH DRILLING MINING
Information Patent Grant
Earth pressure shield
- Patent number 4,844,656
- Issue date Jul 4, 1989
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Siegmund Babendererde
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method of and apparatus for applying a sprayed concrete layer to a...
- Patent number 4,824,022
- Issue date Apr 25, 1989
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Bernd Hillemeier
- E04 - BUILDING
Information Patent Grant
Method and apparatus for the spray placing of concrete layers
- Patent number 4,804,563
- Issue date Feb 14, 1989
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Bernd Hillemeier
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Method of and apparatus for concrete tunnel lining
- Patent number 4,789,267
- Issue date Dec 6, 1988
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Siegmund Babendererde
- E04 - BUILDING
Information Patent Grant
Excavator for making a substantially vertical slot in the ground
- Patent number 4,785,559
- Issue date Nov 22, 1988
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Volker Hentschel
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Apparatus for excavating a substantially vertical slot
- Patent number 4,744,425
- Issue date May 17, 1988
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Volker Hentschel
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Tunnel excavator
- Patent number 4,729,693
- Issue date Mar 8, 1988
- Hochtief Aktiengesellschaft vorm, Gebr. Helfmann
- Volker Hentschel
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method of and apparatus for concrete tunnel lining
- Patent number 4,687,374
- Issue date Aug 18, 1987
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Siegmund Babendererde
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Process for providing a synthetic resin coating on a concrete struc...
- Patent number 4,670,315
- Issue date Jun 2, 1987
- Hochtief Aktiengesellschaft vorm, Gebr. Helfmann
- Bernd Hillemeier
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Apparatus for the construction of tunnels and shafts
- Patent number 4,640,646
- Issue date Feb 3, 1987
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Volker Hentschel
- E21 - EARTH DRILLING MINING
Information Patent Grant
Tunneling machine
- Patent number 4,629,255
- Issue date Dec 16, 1986
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Siegmund Babendererde
- E21 - EARTH DRILLING MINING
Information Patent Grant
Tunneling machine
- Patent number 4,627,765
- Issue date Dec 9, 1986
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Volker Hentschel
- E21 - EARTH DRILLING MINING
Information Patent Grant
Apparatus for setting and removing tunnel casing rings
- Patent number 4,613,258
- Issue date Sep 23, 1986
- Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
- Volker Hentschel
- E21 - EARTH DRILLING MINING

Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann

Organization

Patents Grantslast 30 patents

Drying the surface of a fresh concrete body

Track carrier for a high speed magnetic levitation transport system

Reinforced-concrete building element

Process for making a tunnel and advancing a tunneling read with a w...

Movable sealing assembly for tunneling machines

Form for concrete-placement tunnel lining

Process and apparatus for lining a tunnel with concrete

Earth pressure shield

Earth pressure shield

Method of and apparatus for applying a sprayed concrete layer to a...

Method and apparatus for the spray placing of concrete layers

Method of and apparatus for concrete tunnel lining

Excavator for making a substantially vertical slot in the ground

Apparatus for excavating a substantially vertical slot

Tunnel excavator

Method of and apparatus for concrete tunnel lining

Process for providing a synthetic resin coating on a concrete struc...

Apparatus for the construction of tunnels and shafts

Tunneling machine

Tunneling machine

Apparatus for setting and removing tunnel casing rings