Erwin Siegfried

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Liebefeld, CH

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Patents Grantslast 30 patents

Information Patent Grant
Stressing anchorage for prestressing elements in a part of a structure
- Patent number 5,493,828
- Issue date Feb 27, 1996
- VSL International AG
- David Rogowsky
- E04 - BUILDING
Information Patent Grant
Force transfer body for an anchorage
- Patent number 5,345,742
- Issue date Sep 13, 1994
- VSL International AG
- David Rogowsky
- E04 - BUILDING
Information Patent Grant
Arrangement of prestressing tendons in a pressure tunnel
- Patent number 5,180,253
- Issue date Jan 19, 1993
- Erwin Siegfried
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Prestressed concrete lining in a pressure tunnel
- Patent number 5,066,167
- Issue date Nov 19, 1991
- VSL International AG
- Erwin Siegfried
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Encasing tubing having continuous bonding enhancing properties
- Patent number 5,038,834
- Issue date Aug 13, 1991
- VSL International AG
- Erwin Siegfried
- E04 - BUILDING