| US 7,517,831 B2 | ||
| Pumice stone with a carbon content, process for its production and its applications | ||
| Jean-Pierre Camp, Paris (France); and Serge Bensaid, Rond-Point de Lançon (France) | ||
| Assigned to Sem Stone, Paris (France) | ||
| Appl. No. 11/569,678 PCT Filed May 27, 2005, PCT No. PCT/FR2005/001313 § 371(c)(1), (2), (4) Date Apr. 06, 2007, PCT Pub. No. WO2005/118483, PCT Pub. Date Dec. 15, 2005. |
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| Claims priority of application No. 04 05786 (FR), filed on May 28, 2004. | ||
| Prior Publication US 2007/0267350 A1, Nov. 22, 2007 | ||
| Int. Cl. C01B 31/08 (2006.01); B01D 15/00 (2006.01) | ||
| U.S. Cl. 502—416 [210/691; 210/925] | 7 Claims |
| 1. Pumice stone which has a carbon content of between 5 and 15% by weight, wherein it has a particle size of between 3 and 8 mm and it has a density of less than or equal to 570 kg/m3 and greater than 500 kg/m3. |