Preussag Aktiengesellschaft
23Patents
0Active
23Granted
33Portfolio score
Filing activity: Jun 21, 1974 → May 29, 1992
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4947944A | Device for steering a drilling tool and/or drill string | Fixed Constructions | 70 | Expired |
| US5182731A | Well bore data transmission apparatus | Fixed Constructions | 61 | Expired |
| US4442908A | Tool for drilling curved sections of well holes | Fixed Constructions | 49 | Expired |
| US5246070A | Piping for the completion of a groundwater monitoring site | Mechanical Engineering; Lighting; Heating | 17 | Expired |
| US3939391A | Apparatus for charging a hermetically sealed electrical energy source | Electricity | 13 | Expired |
| US4386473A | Recovery of sediments from the bottom of the sea | Fixed Constructions | 12 | Expired |
| US4316386A | Fluid pressure measuring apparatus for incorporation into a pipeline rising from a well | Fixed Constructions | 11 | Expired |
| US4153357A | Underwater camera | Physics | 11 | Expired |
| US5224389A | Method and apparatus for taking samples from a groundwater monitoring site | Physics | 10 | Expired |
| US4688831A | Threaded or push-type coupling | Fixed Constructions | 10 | Expired |
| US4184758A | Deep sea underwater camera | Physics | 7 | Expired |
| US5154538A | Method and apparatus for removing a liquid phase floating on a surface of groundwater | Performing Operations; Transporting | 7 | Expired |
| US4035816A | Housing assembly for an underwater camera with a flash device | Physics | 6 | Expired |
| US4168673A | Floating island for extracting or processing gas | Performing Operations; Transporting | 6 | Expired |
| US3996678A | Free-fall grab | Fixed Constructions | 5 | Expired |
| US3960511A | Zone melting process | Chemistry; Metallurgy | 4 | Expired |
| US3935058A | Zone melting process | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4293265A | Hydraulically operated hoisting apparatus for a ship for picking floating objects up out of the sea | Performing Operations; Transporting | 3 | Expired |
| US4398361A | Recovery of sediments from the bottom of the sea by suspended suction pipe | Fixed Constructions | 3 | Expired |
| US4580049A | Probe for locating mineral deposits | Physics | 2 | Expired |
| US4652055A | Device for collecting manganese nodules on the ocean floor | Fixed Constructions | 1 | Expired |
| US4160623A | Deep well pump | Mechanical Engineering; Lighting; Heating | 0 | Expired |
| US4158963A | Process for determining the location and/or extent of rock cavities | Fixed Constructions | 0 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.