Gaz de France
128Patents
8Active
128Granted
43Portfolio score
Filing activity: May 3, 1973 → Nov 21, 2007 · 8 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4752213A | Forced-air gas burner | Mechanical Engineering; Lighting; Heating | 78 | Expired |
| US5307437A | Optical fibre incorporating a Bragg lattice and its application | Physics | 63 | Expired |
| US5058437A | Determining the quantity yield of a compressible fluid flowing through a pressure reducing valve | Physics | 54 | Expired |
| US6145544A | Flow conditioner for a gas transport pipe | Physics | 50 | Expired |
| US3948316A | Process of and device for using the energy given off by a heat source | Emerging Cross-Sectional Technologies | 47 | Expired |
| US4518346A | Gas fuel burner with incorporated ignition and safety devices | Mechanical Engineering; Lighting; Heating | 41 | Expired |
| US5771845A | Vaporization method device | Mechanical Engineering; Lighting; Heating | 39 | Expired |
| US5271215A | Natural gas stream turbine system operating with a semi-open cycle | Emerging Cross-Sectional Technologies | 39 | Expired |
| US5554347A | Apparatus for carrying out chemical reactions requiring addition of heat at least during start up | Performing Operations; Transporting | 34 | Expired |
| US5141580A | Connection component for together plastic elements by thermal welding | Performing Operations; Transporting | 34 | Expired |
| US4883753A | High-yield methane production process by culture of Methanobacterium thermoautotrophicum or any other methanogenic bacterium having the same physiological growth properties | Emerging Cross-Sectional Technologies | 33 | Expired |
| US5182440A | Process and connection component using an electrical resistor for the welding of plastic elements | Performing Operations; Transporting | 30 | Expired |
| US5388984A | Method of continuous modulation of a fluid flow rate by means of an electrically controlled sequential valve | Emerging Cross-Sectional Technologies | 29 | Expired |
| US7083123B2 | Internal flame gas burner with high compactness | Mechanical Engineering; Lighting; Heating | 29 | Expired |
| US5121793A | Capping equipment for blowout well | Fixed Constructions | 29 | Expired |
| US5976352A | Process for thermal conversion of hydrocarbons to aliphatic hydrocarbons which are more unsaturated than the starting products, combining a steam cracking step and a pyrolysis step | Emerging Cross-Sectional Technologies | 26 | Expired |
| US5782104A | Integrated air conditioning system with hot water production | Emerging Cross-Sectional Technologies | 26 | Expired |
| US5218651A | Optical fibre incorporating a variable internal Bragg grating and its applications | Physics | 24 | Expired |
| US5573728A | Device for selective detection of gas | Physics | 24 | Expired |
| US5410131A | Welding connection assembly for heat-fusing plastic tubes | Performing Operations; Transporting | 22 | Expired |
| US6509567B2 | Method and apparatus for detecting gases | Physics | 22 | Expired |
| US5178210A | Vapor pump employing counterflow exchange between air and combustion products without an intermediate fluid | Emerging Cross-Sectional Technologies | 21 | Expired |
| US7072809B2 | Method for modelling fluid displacements in a porous environment taking into account hysteresis effects | Physics | 21 | Expired |
| US6082994A | Gas burner for cooking apparatus | Mechanical Engineering; Lighting; Heating | 21 | Expired |
| US6157455A | Method and apparatus for determining the calorific value of a natural gas optically and in real time | Physics | 20 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.