Charbonnages de France
🏢 View company profile →65Patents
0Active
65Granted
38Portfolio score
Filing activity: Sep 12, 1972 → May 26, 1992
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4535853A | Drill bit for jet assisted rotary drilling | Fixed Constructions | 86 | Expired |
| US4071304A | Separation of products in granular form | Chemistry; Metallurgy | 54 | Expired |
| US4873270A | Polyurethane-carbohydrate-based substances which can be calendered to produce biodegradable materials | Chemistry; Metallurgy | 45 | Expired |
| US4550010A | Process for deodorizing polluted air | Human Necessities | 26 | Expired |
| US4647112A | Rotary cutter for gouging out ore from mine faces | Fixed Constructions | 25 | Expired |
| US4838185A | Fluid fuel combustion process and turbulent-flow burner for implementing same | Mechanical Engineering; Lighting; Heating | 21 | Expired |
| US4919611A | Fluid fuel combustion process and turbulent-flow burner for implementing same | Mechanical Engineering; Lighting; Heating | 20 | Expired |
| US4624339A | Sound-proofing casing for a pneumatic percussive drill | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4628831A | Hearth and process for fluidized-bed treatment of a fuel | Performing Operations; Transporting | 16 | Expired |
| US4608552A | Process and device for the remote transmission of signals and application to the detection and/or measurement of the quanity of combustible gas in an atmosphere | Physics | 13 | Expired |
| US3979168A | Apparatus for the manufacture of light granulates | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4699060A | Detonation arrestor device for bulk explosive materials transfer | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US4862157A | Signal transfer method and equipment for electric machine equipped with three-phase power supply cable | Emerging Cross-Sectional Technologies | 12 | Expired |
| US5234837A | Pseudo-continuous process for interrogating a combustible gas detector | Physics | 11 | Expired |
| US4235024A | Fluidized bed treatment apparatus | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4057605A | Manufacture of light granular materials | Chemistry; Metallurgy | 10 | Expired |
| US4534230A | Individual portable dust collector | Physics | 10 | Expired |
| US4980681A | Direct view remote control method for workings machine and transmitter and receiver assembly for carrying out such method | Emerging Cross-Sectional Technologies | 9 | Expired |
| US4968492A | Device for feeding fluidizing gas to the openings in a grid for supporting a bed of particles to be fluidized | Performing Operations; Transporting | 9 | Expired |
| US4736711A | Fluidized-bed heat generator with improved means for ash removal and heat recovery | Mechanical Engineering; Lighting; Heating | 9 | Expired |
| US4712153A | Power circuit and trigger device comprising same | Electricity | 8 | Expired |
| US4616426A | Valve for the pneumatic distribution of fluidizable material | Performing Operations; Transporting | 8 | Expired |
| US4338160A | Process for drying and/or preheating coal | Chemistry; Metallurgy | 8 | Expired |
| US4669921A | Device for supplying a powdery product in gravimetrically metered amounts to a pneumatic line | Physics | 7 | Expired |
| US4129990A | Advancing support | Fixed Constructions | 7 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.