LIQUID FILTERS AND GAS DIFFUSERS MADE OF POROUS CERAMIC MATERIALS; NAMELY, ALUMINO SILICATES, ALUMINA, MAGNESIA, ZIRCON, ZIRCONIA, SILICON CARBIDE, SILICON NITRIDE, WOLLASTONITE, MULLITE, CARBON AND MIXTURES OF THESE FOR USE IN THE FILTRATION OF LIQUIDS AND FOR THE DIFFUSION OF GASES; CERAMIC FILTERS FOR USE IN METAL PURIFICATION AND CASTING; CERAMIC CRUCIBLES, POUR CUPS, FUNNELS, RUNNER TUBES, LAUNDERS AND PARTS THEREFOR

'alumina':14 'alumino':12 'carbid':19 'carbon':24 'cast':50 'ceram':9,42,51 'crucibl':52 'cup':54 'diffus':5,39 'filter':2,43 'filtrat':33 'funnel':55 'gas':4 'gase':41 'launder':58 'liquid':1,35 'made':6 'magnesia':15 'materi':10 'metal':47 'mixtur':26 'mullit':23 'name':11 'nitrid':21 'part':60 'porous':8 'pour':53 'purif':48 'runner':56 'silic':13 'silicon':18,20 'therefor':61 'tube':57 'use':30,45 'wollastonit':22 'zircon':16 'zirconia':17

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