Gaz de France-Service National
10Patents
0Active
10Granted
33Portfolio score
Filing activity: Feb 13, 1989 → Sep 24, 2003
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6049508A | Method for seismic monitoring of an underground zone under development allowing better identification of significant events | Physics | 162 | Expired |
| US5613373A | Process and apparatus for cooling a fluid especially for liquifying natural gas | Emerging Cross-Sectional Technologies | 24 | Expired |
| US5620625A | Method of butt-welding two plastic parts with an identifying code, using an automatically controlled electro-welding machine | Emerging Cross-Sectional Technologies | 21 | Expired |
| US4963290A | Corrosion inhibitors of steels and aqueous compositions of alkali meal halide containing them | Chemistry; Metallurgy | 18 | Expired |
| US5535594A | Process and apparatus for cooling a fluid especially for liquifying natural gas | Emerging Cross-Sectional Technologies | 13 | Expired |
| US5138136A | Method, circuit and apparatus for supplying an electrical current to a resistive heating element | Performing Operations; Transporting | 12 | Expired |
| US6182012A | Method and device intended for permanent monitoring of an underground formation | Physics | 6 | Expired |
| US7420879B2 | Device for seismic emission in an underground formation and method for implementing same | Physics | 3 | Expired |
| US7325647B2 | Mobile system for seismic emission with fixed coupling devices, and method therefor | Physics | 1 | Expired |
| US5318678A | Method and apparatus for analyzing the state of protection against corrosion of a work under cathodic protection | Chemistry; Metallurgy | 1 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.