Dyckerhoff & Widmann Aktiengesellschaft
103Patents
0Active
103Granted
42Portfolio score
Filing activity: Sep 27, 1973 → Aug 2, 1999
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4908129A | Impervious layer formation process and landfill adsorption system | Fixed Constructions | 51 | Expired |
| US4363462A | Recoverable formwork part for forming the anchoring location of a tendon in a concrete structural component | Emerging Cross-Sectional Technologies | 44 | Expired |
| US4633540A | Tension tie member | Fixed Constructions | 35 | Expired |
| US4312288A | Floating structure for effecting energy transformation from sea water | Emerging Cross-Sectional Technologies | 32 | Expired |
| US4648146A | Apparatus for and method of assembling a tension tie member | Fixed Constructions | 27 | Expired |
| US4630971A | Apparatus for anchoring rock and the like | Mechanical Engineering; Lighting; Heating | 27 | Expired |
| US4473915A | Tension member and a method of assembling and installing the tension member | Fixed Constructions | 27 | Expired |
| US4718209A | Wedge anchorage for a tension member in a prestressed concrete structure | Fixed Constructions | 26 | Expired |
| US4449855A | Anchor head for a corrosion-protected injected anchor | Fixed Constructions | 26 | Expired |
| US4958961A | Anchoring arrangement for a rod-shaped tension member formed of fiber reinforced composite material | Emerging Cross-Sectional Technologies | 24 | Expired |
| US4594827A | Tension member, particularly for use as a diagonal cable in a stayed girder bridge | Fixed Constructions | 24 | Expired |
| US4185440A | Method of and parts used in the construction of a prestressed concrete structure | Emerging Cross-Sectional Technologies | 24 | Expired |
| US5809710A | Method of tensioning a tension member composed of a plurality of individual elements | Fixed Constructions | 24 | Expired |
| US4850746A | Rock anchor assembly for securing roadways and wall surfaces of open cuts and tunnels | Fixed Constructions | 21 | Expired |
| US4366654A | Double-walled tank for low-temperature liquids | Mechanical Engineering; Lighting; Heating | 21 | Expired |
| US4343122A | System for anchoring a tendon in a structural concrete unit | Fixed Constructions | 21 | Expired |
| US4137686A | Steel rods with hot rolled ribs formed in a partial spiral | Fixed Constructions | 21 | Expired |
| US5056284A | Bundled tensioning member for prestressing a tall structural member and method of installing same | Fixed Constructions | 21 | Expired |
| US4848052A | Spacer for tension member | Fixed Constructions | 21 | Expired |
| US4878327A | Corrosion protected tension member for use in prestressed concrete and method of installing same | Fixed Constructions | 20 | Expired |
| US4664555A | Tension member for a rock anchor or the like | Fixed Constructions | 18 | Expired |
| US4103861A | Arrangement for the sectional cantilever projection of multi-panel bridge supporting structures of steel or prestressed concrete | Fixed Constructions | 18 | Expired |
| US5472296A | Corrosion protected support element for a soil anchor or a rock anchor, a pressure pile or the like | Fixed Constructions | 18 | Expired |
| US4469756A | Method of and apparatus for forming an outwardly projecting bulge in a steel wire strand for forming an anchor in concrete | Emerging Cross-Sectional Technologies | 18 | Expired |
| US4473936A | Process for manufacturing a protection against corrosion for cables of high-strength steel wires | Emerging Cross-Sectional Technologies | 16 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.